यदि $\sin x + \sin^2 x = 1$ है,तो $\cos^8 x + 2\cos^6 x + \cos^4 x = $

  • A
    $0$
  • B
    $-1$
  • C
    $2$
  • D
    $1$

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यदि $\cos^3 80^{\circ} + \cos^3 40^{\circ} - \cos^3 20^{\circ} = k$ है,तो $\frac{4k}{3} =$

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$\operatorname{Sech}^{-1}(\sin \alpha) =$

यदि $\sin^{2}(10^{\circ}) \sin(20^{\circ}) \sin(40^{\circ}) \sin(50^{\circ}) \sin(70^{\circ}) = \alpha - \frac{1}{16} \sin(10^{\circ})$ है,तो $16 + \alpha^{-1}$ का मान ज्ञात कीजिए।

$\frac{\cos 12^{\circ}-\sin 12^{\circ}}{\cos 12^{\circ}+\sin 12^{\circ}}+\frac{\sin 147^{\circ}}{\cos 147^{\circ}} = $

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