કિંમત શોધો: $\cos^2 76^\circ + \cos^2 16^\circ - \cos 76^\circ \cos 16^\circ$

  • A
    $-1/4$
  • B
    $1/2$
  • C
    $0$
  • D
    $3/4$

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$x$ ની કઈ કિંમત માટે $\cos x > \sin x$ થાય,જ્યાં $x \in \left( \frac{\pi}{2}, \frac{3\pi}{2} \right)$?

જો $\cos (\theta - \alpha ), \cos \theta$ અને $\cos (\theta + \alpha )$ એ $H.P.$ માં હોય,તો $\cos \theta \sec \frac{\alpha }{2}$ ની કિંમત શોધો.

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