જો $\sin \alpha = -\frac{3}{5},$ જ્યાં $\pi < \alpha < \frac{3\pi}{2}$ હોય,તો $\cos \frac{\alpha}{2} = $

  • A
    $-\frac{1}{\sqrt{10}}$
  • B
    $\frac{1}{\sqrt{10}}$
  • C
    $\frac{3}{\sqrt{10}}$
  • D
    $-\frac{3}{\sqrt{10}}$

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$\frac{{\cos {{10}^o} + \sin {{10}^o}}}{{\cos {{10}^o} - \sin {{10}^o}}} = $

જો $A + B + C = \pi$ હોય,તો $\tan^2 \frac{A}{2} + \tan^2 \frac{B}{2} + \tan^2 \frac{C}{2}$ હંમેશા કેટલા થાય?

જો $\tan \theta \cdot \cos 60^{\circ} = \frac{\sqrt{3}}{2}$ હોય,તો $\sin (\theta - 15^{\circ})$ ની કિંમત શોધો.

$cosec^2 \theta = \frac{4xy}{(x + y)^2}$ ત્યારે જ સાચું છે જો

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