$\frac{1+\cos \theta-\sin \theta}{1+\cos \theta+\sin \theta}+\frac{1+\cos \theta+\sin \theta}{1+\cos \theta-\sin \theta}=$

  • A
    $2 \sec \theta$
  • B
    $2 \operatorname{cosec} \theta$
  • C
    $2 \tan \theta$
  • D
    $2 \cot \theta$

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જો $x$ અને $y$ લઘુકોણ હોય કે જેથી $\cos x + \cos y = \frac{3}{2}$ અને $\sin x + \sin y = \frac{3}{4}$ થાય,તો $\sin(x + y)$ ની કિંમત શોધો.

$0 < x \leq \pi$ માટે, $\sinh ^{-1}(\cot x)$ ની કિંમત શું થાય?

જો $\sin \theta + \operatorname{cosec} \theta = 4$ હોય,તો $\sin^2 \theta + \operatorname{cosec}^2 \theta = $

$\left( 1 + \cos \frac{\pi }{9} \right) \left( 1 + \cos \frac{3\pi }{9} \right) \left( 1 + \cos \frac{5\pi }{9} \right) \left( 1 + \cos \frac{7\pi }{9} \right)$ નું મૂલ્ય શોધો.

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