$1 - 2{\sin ^2}\left( {\frac{\pi }{4} + \theta } \right) = $

જો $\sin \alpha = \frac{{336}}{{625}}$ અને $450^\circ < \alpha < 540^\circ ,$ તો $\sin \left( {\frac{\alpha }{4}} \right) = $

જો ${\rm{cosec}}\theta = \frac{{p + q}}{{p - q}},$ તો $\cot \,\left( {\frac{\pi }{4} + \frac{\theta }{2}} \right) = $

$\sin \frac{\pi }{{14}}\sin \frac{{3\pi }}{{14}}\sin \frac{{5\pi }}{{14}}\sin \frac{{7\pi }}{{14}}\sin \frac{{9\pi }}{{14}}\sin \frac{{11\pi }}{{14}}\sin \frac{{13\pi }}{{14}}  = . . . .$

જો $\tan \frac{\theta }{2} = t,$ તો $\frac{{1 - {t^2}}}{{1 + {t^2}}}  = . . . .$

$\tan 3A - \tan 2A - \tan A = $