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

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

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$\sin^{2} 15^{\circ} + \sin^{2} 75^{\circ} = \dots$

यदि $\sec \theta = \frac{13}{5}$ है,तो $\cos \theta = \ldots \ldots \ldots \ldots$

यदि $\sin \theta + \cos \theta = \sqrt{3}$ है,तो सिद्ध कीजिए कि $\tan \theta + \cot \theta = 1$ है।

$2 \sin ^{2} \theta+4 \sec ^{2} \theta+5 \cot ^{2} \theta+2 \cos ^{2} \theta-4 \tan ^{2} \theta-5 \operatorname{cosec}^{2} \theta = \dots$

यदि $\sqrt{3} \tan \theta = 1$ है,तो $\sin^{2} \theta - \cos^{2} \theta$ का मान ज्ञात कीजिए।

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