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Question Number 86723 by A8;15: last updated on 30/Mar/20

Commented by jagoll last updated on 30/Mar/20

$$\cos {}^2\mathrm{x}-\sin {}^2\mathrm{x}=\tan \mathrm{x}\times \cot \mathrm{x}$$$$\cos 2\mathrm{x}=1\Rightarrow \{\begin{array}{l}\mathrm{x}=0\\ \mathrm{x}=\pi \end{array}$$

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