$\frac{\sec \theta-1}{\sec \theta+1} = \ldots$

  • A
    $\tan \theta$
  • B
    $\frac{1-\sin \theta}{1+\sin \theta}$
  • C
    $\frac{\operatorname{cosec} \theta-1}{\operatorname{cosec} \theta+1}$
  • D
    $\frac{1-\cos \theta}{1+\cos \theta}$

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

સાબિત કરો કે $\tan ^{4} \theta+\tan ^{2} \theta=\sec ^{4} \theta-\sec ^{2} \theta$

જો $\sin \theta + \cos \theta = p$ અને $\sec \theta + \operatorname{cosec} \theta = q$ હોય,તો સાબિત કરો કે $q(p^2 - 1) = 2p$.

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

$\frac{\cos (90^{\circ}- A ) \sin (90^{\circ}- A )}{\tan (90^{\circ}- A )}$ નું સાદું રૂપ ....... છે.

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