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Question Number 165370 by daus last updated on 31/Jan/22

Commented by daus last updated on 31/Jan/22

$$solvex$$

Answered by Ar Brandon last updated on 31/Jan/22

$$\cos (3x+60°)=\sin \left(3x\right)$$$$\cos (3x+\frac{\pi }{3})=\cos (\frac{\pi }{2}-3x)$$$$3x+\frac{\pi }{3}=\frac{\pi }{2}-3x\Rightarrow x=\frac{\pi }{36}$$

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