Mathematics, 28.04.2021 16:50 XxrazorxX11

$\frac{1 - \cos {}^{4} ( \beta ) }{ \sin {}^{4} ( { \beta }^{} ) } = 1 + 2 \cot {}^{2} ( \beta )$ Please Prove This Problem By Doing in LHS side. I try my best but i couldn't solve this. so please solve it.

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Please Prove This Problem By Doing in LHS side. I try my best but i couldn't solve this. so please...