$\frac{\sin A - 2 \sin^3 A}{2 \cos^3 A - \cos A}$ નું મૂલ્ય શું છે?

  • A
    $\cot A$
  • B
    $\operatorname{cosec} A$
  • C
    $\sec A$
  • D
    $\tan A$

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જો $\cos \theta = \frac{1}{2}\left( x + \frac{1}{x} \right)$ હોય,તો $\frac{1}{2}\left( x^2 + \frac{1}{x^2} \right) = $

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