$2\cos^2 \theta - 2\sin^2 \theta = 1$,તો $\theta = \dots \dots ^\circ$

  • A
    $15$
  • B
    $30$
  • C
    $45$
  • D
    $60$

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જો $\alpha$ એ $25\cos^2\theta + 5\cos\theta - 12 = 0$ નું બીજ હોય અને $\pi/2 < \alpha < \pi$ હોય,તો $\sin 2\alpha$ ની કિંમત શોધો.

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