cos−1(1+cosα cosβ cosα cosβ )=2tan−1(tan2α tan2β ).

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Question

$cos^{- 1} (\frac{cos α cos β}{1 + cos α cos β}) = 2 t an^{- 1} (tan \frac{α}{2} tan \frac{β}{2})$ .

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Charlotte Discussed

cos^{- 1} (\frac{cos α cos β}{1 + cos α cos β}) = 2 t an^{- 1} (tan \frac{α}{2} tan \frac{β}{2})

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Question Text

cos^{- 1} (\frac{cos α cos β}{1 + cos α cos β}) = 2 t an^{- 1} (tan \frac{α}{2} tan \frac{β}{2})