જો $A = 30^{\circ}$ હોય,તો $\cos 2A$ ની કિંમત $\ldots \ldots \ldots$ થાય.

  • A
    $1$
  • B
    $0$
  • C
    $\frac{1}{2}$
  • D
    $\frac{\sqrt{3}}{2}$

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Similar Questions

$\sec 55^{\circ} \cdot \sin 35^{\circ} + \cos 35^{\circ} \cdot \operatorname{cosec} 55^{\circ} = \ldots \ldots \ldots \ldots$

$\sin (90^\circ - \theta) = \ldots \ldots \ldots$

જો $\sin 70^{\circ} = \cos \theta$ હોય,તો $\theta = \ldots \ldots \ldots \ldots$ ($^{\circ}$ માં)

જો $\cos 9 \alpha = \sin \alpha$ અને $9 \alpha < 90^{\circ}$ હોય,તો $\tan 5 \alpha$ ની કિંમત શોધો.

જો $\sin \theta + 2 \cos \theta = 1$ આપેલ હોય,તો સાબિત કરો કે $2 \sin \theta - \cos \theta = 2$.

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