જો $\cos(\alpha + \beta) = 0$ હોય,તો $\sin(\alpha + 2\beta) =$

  • A
    $\sin \alpha$
  • B
    $-\sin \alpha$
  • C
    $\cos \beta$
  • D
    $-\cos \beta$

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$\tan 1^\circ \tan 2^\circ \tan 3^\circ \dots \tan 89^\circ$ ની કિંમત કેટલી થાય?

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