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Question Number 166296 by mathlove last updated on 18/Feb/22

$${\left(\cos x\right)}^{2022}-{\left(\sin x\right)}^{2022}=1$$$$x=?$$

Commented by mkam last updated on 18/Feb/22

$$\mathit{x}=\mathit{n}\mathit{\pi }\mathrm{\forall }\mathit{n}\in \mathit{Z}$$

Commented by mathlove last updated on 19/Feb/22

$$How?$$

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