નીચેનામાંથી કઈ નિત્યસમ સાચી છે?

  • A
    $\cos 5 \theta = 16 \cos ^5 \theta - 20 \cos ^3 \theta - 5 \cos \theta$
  • B
    $\cos 5 \theta = 20 \cos ^3 \theta - 16 \cos ^5 \theta + 5 \cos \theta$
  • C
    $\cos 5 \theta = 16 \cos ^5 \theta + 20 \cos ^3 \theta - 5 \cos \theta$
  • D
    $\cos 5 \theta = 16 \cos ^5 \theta - 20 \cos ^3 \theta + 5 \cos \theta$

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જો $\frac{2 \sin \theta}{1+\cos \theta+\sin \theta}=y$ હોય,તો $\frac{1-\cos \theta+\sin \theta}{1+\sin \theta}=$

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$\cot x - \tan x = $

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