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

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

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'True' (सत्य) या 'False' (असत्य) लिखिए और अपने उत्तर का औचित्य बताइए।
$(\tan \theta+2)(2 \tan \theta+1)=5 \tan \theta+\sec ^{2} \theta$

$\sin \theta \cdot \cos (90^\circ - \theta) = \ldots \ldots \ldots$

यदि $5 \cos A = 4 \sin A$,तो $\tan A = \ldots$

यदि $\sin 70^{\circ} = \cos \theta$ है,तो $\theta = \ldots \ldots \ldots \ldots$ ($^{\circ}$ में)

$\cot \theta \cdot \tan \theta = \dots$

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