यदि $x = \sec \theta + \tan \theta$ है,तो $x + \frac{1}{x} = $

  • A
    $1$
  • B
    $2 \sec \theta$
  • C
    $2$
  • D
    $2 \tan \theta$

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$\sin 50^\circ - \sin 70^\circ + \sin 10^\circ = $

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