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At x='p' the function f(x)=sin3xcos3x , ...

At x='p' the function `f(x)=sin3xcos3x , , is

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Given function is
f(x)= sin3x−cos3x
f′(x)=3cos3x+3sin3x
For critical points of function f(x) f'(x)=0
⟹3cos3x+3sin3x=0
⟹cos3x+sin3x=0
⟹sin3x=−cos3x
...
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