solution
• Short teaching video

Watch Teaching Video, explaining how to enter math problem.

• How to enter a task condition

Click on the "Enter your task" button. After that, enter the condition either with your keyboard, or from the keyboard on the screen. To add special math constructions, such as integral or fraction, use the keyboard on the page. By the condition can be moved using the buttons on your keyboard: left, right, up, down or with the mouse clicking in the desired area. If you want to copy the condition or part of the condition, select it (hold down the shift button and the left or right arrows select the desired area) and press ctrl + c. To insert to the desired location, click ctrl + v. When copying, automatic transformation to a mathematical format occurs lateh, so you can copy your condition both in your text editor and in another input window on the site. Only one task can be solved at a time.

• How to enter a system of equations

If you have entered several conditions, they will be considered as a system, for example, a system equations or inequalities.

• How to simplify the expression

Just enter your expression as a condition and click on the "Solve" button. No need to set the "=" sign at the end of your expression or perform any other actions

• Variables and parameters

By default, when solving, the variables are x, y, z, a parameters: a, b, c. If you have in other variables or parameters are indicated for the task, click on the "Settings" button, enter your variables and parameters separated by commas in the appropriate fields and click on the button "OK". When solving the following problem, do not forget to return the original version. For this just clear the fields and click OK.

• How to fill gray squares

To fill the gray box, move the cursor to it. You can do this either by clicking arrows <-,-> on the keyboard, or just click on it. Next enter your data there and click on the space bar or arrow ->.

• How to introduce initial conditions for differential equations

Enter the initial conditions as normal conditions. Order is not important. For example:
Condition 1: y'=y+x
Condition 2: y(0)=1

• Shift cursor one character to the left: ←

To move the cursor to the left of the current position, press the button ←.

• Shift cursor one character to the right: →

To move the cursor to the right of the current position, click on the button →.

• Delete one character back: ←

To delete a character, place the cursor after the character and press the button ←. Move the cursor can be either using the left and right arrows on the keyboard or click in the area after the symbol.

• Delete one character forward: del

To delete a character, place the cursor in front of the character and click on the button del. You can move the cursor either with the left arrow and right on the keyboard or click in the area in front of the symbol.

• Number: 0

To enter the number 0, press the button 0.

• Number: 1

To enter the number 1, press the button 1.

• Number: 2

To enter the number 2, press the button 2.

• Number: 3

To enter the number 3, press the button 3.

• Number: 4

To enter the number 4, press the button 4.

• Number: 5

To enter the number 5, press the button 5.

• Number: 6

To enter the number 6, press the button 6.

• Number: 7

To enter the number 7, press the button 7.

• Number: 8

To enter the number 8, press the button 8.

• Number: 9

To enter the number 9, press the button 9.

• Point for entering non-integer numbers

To enter a point for entering a non-integer number (for example 10.2), press the button .

• Enter variable: x

To enter the variable x, press the x button. The standard variables are: x, y, z. To enter a non-standard variable, click on the corresponding character on your keyboard and add this variable in the settings. See the tip "Variables and parameters"

• Enter variable: y

To enter the variable y, press the y button. The standard variables are: x, y, z. To enter a non-standard variable, click on the corresponding character on your keyboard and add this variable in the settings. See the tip "Variables and parameters"

• Enter variable: z

To enter the variable x, press the x button. The standard variables are: x, y, z. To enter a non-standard variable, click on the corresponding character on your keyboard and add this variable in the settings. See the tip "Variables and parameters"

• Enter root

To enter the root, place the cursor in the place where you want to enter the root (do this can be done either by clicking the mouse in the desired area, or using the left, right arrows on keyboard). Next, click on the button on the keyboard. A root will appear. Cursor will automatically be under the root. Next, enter the root expression and after that Click the right arrow.

• Enter a variable in degree

To enter a variable in a power, place the cursor in the place where you want to enter (this can be done either by clicking the mouse in the desired area, or using the left arrows, right on the keyboard). Next, click on the button on the keyboard. An x in power will appear. The cursor will automatically appear in power. Next, enter the degree and after that click on right arrow. If you need to change the variable, click on x mouse or move on it using the left and right arrows on the keyboard. Next, delete x with the help of red keys on the keyboard (red left arrow or del) and enter the variable you need. To continue entering the formula on the right, click on the right part with the mouse or using Move the cursor to the right to the right.

• Introduce an expression to a power

To enter an expression in a power, position the cursor where you want to enter (this can be done either by clicking the mouse in the desired area, or using the left arrows, right on the keyboard). Next, click on the button on the keyboard. A () will appear in the power. The cursor will automatically appear in power. Next, enter the degree and after that go inside brackets (you can do this either by clicking on the desired area or using arrows left, right on the keyboard). Next, enter the desired expression in parentheses. To continue entering the formula on the right, click on the right part with the mouse or using Move the cursor to the right to the right.

• Nth root

To enter the root of the nth degree, place the cursor in the place where you want to enter root (you can do this either by clicking the mouse in the desired area, or using the arrows left, right on the keyboard). Next, click on the button on the keyboard. A root will appear. The cursor will automatically be under the root. Next, enter the root expression and after click on the degree box with the mouse, or go there using the left arrows, right on the keyboard. Enter the degree.

• Fraction

To enter a fraction, place the cursor in the place where you want to enter a fraction (do this you can either by clicking in the desired area, or using the left, right arrows on keyboard). Next, click on the button on the keyboard. A fraction will appear. Cursor automatically will be in the numerator. Next, enter the numerator and after that click on the box denominator with the mouse, or go there using the left, right arrows on the keyboard. Enter the denominator.

• +

To enter +, click the button +

• -

To enter -, click the button -

• Multiplication sign

To enter the multiplication sign, click on the button $\cdot$·

• Division sign

To enter a division mark, press the button :

• Module

To enter a module, click on the button, the cursor will automatically be inside the module, enter the expression, then click the right arrow.

• Round brackets

To enter parentheses, click on the button, the cursor will automatically be inside parentheses, enter an expression, then click the right arrow.

• cos

To enter cos, click on the button, enter the expression, then click on the arrow to the right.

• sin

To enter sin, click on the button, enter the expression, then click on the arrow to the right.

• tan

To enter tan, click on the button, enter the expression, then click on the arrow to the right.

• cot

To enter cot, click on the button, enter the expression, then click on the arrow to the right.

• ln

To enter ln, click on the button, enter the expression, then click on the arrow to the right.

• lg

To enter lg, click on the button, enter the expression, then click on the arrow to the right.

• log

To enter log, click on the button, enter the expression under the logarithm, then click on a box to enter the base (you can do this either by clicking on the desired area, or using the left, right arrows on the keyboard), enter the base and go arrows to the desired area to continue entering.

• a

Parameter a. Standard parameters are: a, b, c. To enter a custom parameter, add this parameter in the settings. See the tip "Variables and parameters"

• b

Parameter b. Standard parameters are: a, b, c. To enter a custom parameter, add this parameter in the settings. See the tip "Variables and parameters"

• c

Parameter c. Standard parameters are: a, b, c. To enter a custom parameter, add this parameter in the settings. See the tip "Variables and parameters"

• α

α

• β

β

• γ

γ

• Π

Π

• e

e

• >

>

• <

<

• =

=

• arccos

To enter arccos, click on the button, enter the expression, click on the right arrow.

• arcsin

To enter arcsin, click on the button, enter the expression, click on the right arrow.

• arctan

To enter arctan, click on the button, enter the expression, click on the right arrow.

• arccot

To enter arccot, click on the button, enter the expression, click on the right arrow.

• '

To enter the derivative icon, click on the button.

• To enter an indefinite integral, click on the button. Next, enter the integrand expression, then press the d button and enter the variable by which you want to carry out integration. Leave the gray squares blank. To enter specific integral, click on the button. Next, enter the integrand, after press the d button (on your keyboard or site keyboard) and type the variable on which to integrate. After that click on the bottom gray box and enter the lower limit, click on the upper gray box and enter upper limit. (you can go to the gray squares either by clicking on them, or using buttons left, right)

• d

Differential sign. The designation of the variable by which to integrate.

• lim

To enter the limit, press the lim button on the keyboard. The cursor will automatically set to the place where you want to enter the function. Next, click on the gray box below the lim icon by mouse or go there using the left, right keys. Enter a limit condition. Next, click on the solve button (you do not need to write an equal sign after the limit).

• ->(seeks)

To enter the icon ->(seeks), click on the button.

• Infinity sign

To enter the infinity icon, click on the corresponding button.

• Sign of the sum (row)

To enter a row, press the sum button on the keyboard. The cursor will automatically set to the place where you want to enter the row. Next, click on the gray box below the sum icon with the mouse Or go there using the left, right keys. Enter the bottom condition. Further click on the gray box above the sum icon with the mouse or go there using the keys left, right. Enter the top condition. Next, click on the Check button convergence.

• Matrix

To enter the matrix, click on the button. A 2 by 2 matrix appears. Each matrix cell must be in braces {}. To enter data in a cell, click inside braces or go there using the left, right buttons. In order to add a cell, place the cursor outside curly brackets with the mouse or the left buttons, right and click the add item button. Braces will appear, enter there element value. To add a line, click the add line button.

In order to add a new element (cell) to the matrix, place the cursor outside the curly brackets with the mouse or the left, right and click buttons item.

To add a new row to the matrix, click the add row button.

• Factorial(!)

To enter the factorial, click on the button !

• n

To enter the variable n, press the n button

• Fourier Series

To expand in the Fourier series, it is necessary to introduce the problem in the form of two conditions, for example:

1. y(x) = 5x

2. (-3,3)

• Line up taylor

To expand into a Taylor series, you need to enter the task in the form of two conditions, for example:

1. y(x) = sinx

2. x = 0

• Perform function analysis

Complete function research:

- Intervals ascending, descending

- Extremums

- The intervals of convexity, concavity

Define the function as a single condition, for example:

1. y(x) = x+5