$\tan 1^\circ \tan 2^\circ \tan 3^\circ \tan 4^\circ \dots \tan 89^\circ = $

  • A
    $1$
  • B
    $0$
  • C
    $\infty$
  • D
    $1/2$

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$(\operatorname{cosec} a - \sin a)(\sec a - \cos a)(\tan a + \cot a)$ का मान ज्ञात कीजिए।

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