यदि $\sin x + \sin^2 x = 1$ है,तो $\cos^{12} x + 3\cos^{10} x + 3\cos^8 x + \cos^6 x - 2$ का मान क्या होगा?

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

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यदि $\cos \theta - \sin \theta = \sqrt{2} \sin \theta$ है,तो $\cos \theta + \sin \theta$ का मान क्या होगा?

$\frac{\sin^2 A - \sin^2 B}{\sin A \cos A - \sin B \cos B} = $

$\cos \frac{\pi }{5} \cos \frac{2\pi }{5} \cos \frac{4\pi }{5} \cos \frac{8\pi }{5} = $

$\frac{\sec 8A - 1}{\sec 4A - 1} = $

यदि $f(x) = \cos^2 x + \sec^2 x$ है,तो

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