Initial task:
sin x+cos x=0
Solution:
Step 1 The linear combination of sine and cosine on the left side of the equation
Condition
sin x+cos x=0
is changed on:
√2 sin( x+π/4)=0
Step 2 Divide both sides of the equation by a nonzero factor
√2
Condition
√2 sin( x+π/4)=0
is changed on:
sin( x+π/4)=0
...
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