$\sin 12^\circ \sin 48^\circ \sin 54^\circ = $
$1/16$
$1/32$
$1/8$
$1/4$
$\frac{{\cos A}}{{1 - \sin A}} = $
$\cos \alpha .\sin (\beta - \gamma ) + \cos \beta .\sin (\gamma - \alpha ) + \cos \gamma .\sin (\alpha - \beta ) = $
यदि $\cos \left( {\frac{{\alpha - \beta }}{2}} \right) = 2\cos \left( {\frac{{\alpha + \beta }}{2}} \right)$, तो $\tan \frac{\alpha }{2}\tan \frac{\beta }{2}$ का मान होगा
यदि ${\tan ^2}\theta = 2{\tan ^2}\phi + 1,$ तब $\cos 2\theta + {\sin ^2}\phi $ बराबर है
यदि $\cos A = \frac{3}{4}$, तब $32\sin \frac{A}{2}\cos \frac{5}{2}A = $