यदि $\triangle ABC$ में $C$ पर समकोण है,तो $\cos(A + B)$ का मान ज्ञात कीजिए।

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

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यदि $\sin \theta + \cos \theta = p$ और $\sec \theta + \operatorname{cosec} \theta = q$ है,तो सिद्ध कीजिए कि $q(p^2 - 1) = 2p$.

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