Question Number 163020 by amin96 last updated on 03/Jan/22
$$\boldsymbol{\mathrm{cos}}^{\mathrm{2}\boldsymbol{\mathrm{n}}} \left(\boldsymbol{\mathrm{x}}\right)+\boldsymbol{\mathrm{sin}}^{\mathrm{2}\boldsymbol{\mathrm{n}}} \left(\boldsymbol{\mathrm{x}}\right)=\frac{\mathrm{4}^{\boldsymbol{\mathrm{n}}} +\mathrm{1}}{\mathrm{5}^{\boldsymbol{\mathrm{n}}} } \\ $$$$\boldsymbol{\mathrm{prove}}\:\boldsymbol{\mathrm{that}} \\ $$
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
$${you}\:{cant}\:{prove},\:{because}\:{it}'{s}\:{not}\:{true}. \\ $$