Mathematics, 10.03.2021 21:50 adamsc819

$\frac{ \cos(3x ) + \cos(5x) }{ \cos(3x) - \cos(5x) } = \cot(x) \cot(4x)$ establish the identity

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$\frac{ \cos(3x ) + \cos(5x) }{ \cos(3x) - \cos(5x) } = \cot(x) \cot(4x)$ establish the identity