$\cos 20^\circ \cos 40^\circ \cos 80^\circ = $

  • A
    $1/2$
  • B
    $1/4$
  • C
    $1/6$
  • D
    $1/8$

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જો $\cot \theta + \tan \theta = m$ અને $\sec \theta - \cos \theta = n$ હોય,તો નીચેનામાંથી કયું સાચું છે?

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$\sin 4\theta$ ને કેવી રીતે લખી શકાય?

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