$(1-\cos \theta)(1+\cos \theta) = \dots$

  • A
    $\operatorname{cosec}^{2} \theta$
  • B
    $\cos ^{2} \theta$
  • C
    $2-\cos ^{2} \theta$
  • D
    $\sin ^{2} \theta$

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

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