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Question Number 163020 by amin96 last updated on 03/Jan/22

$${\mathbf{cos}}^{2\mathbf{n}}\left(\mathbf{x}\right)+{\mathbf{sin}}^{2\mathbf{n}}\left(\mathbf{x}\right)=\frac{4^{\mathbf{n}}+1}{5^{\mathbf{n}}}$$$$\mathbf{prove}\mathbf{that}$$

Commented by amin96 last updated on 03/Jan/22

$$$$I came across it on Instagram. It is not correct in my opinion. I posted the question here to get other people's opinions.

Commented by mr W last updated on 03/Jan/22

$$youcantprove,because{it}^{\prime }snottrue.$$

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