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If (costheta=cosalphacosbeta , prove tha...

If `(costheta=cosalphacosbeta` , prove that `t a n(theta+alpha)/2t a n(theta-alpha)/2=t a n^2beta/2` .

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To prove that \[ \frac{\tan\left(\frac{\theta + \alpha}{2}\right)}{\tan\left(\frac{\theta - \alpha}{2}\right)} = \tan^2\left(\frac{\beta}{2}\right) \] given that ...
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