$\frac{\cos A}{1 - \sin A} = $

  • A
    $\sec A - \tan A$
  • B
    $\csc A + \cot A$
  • C
    $\tan \left( \frac{\pi}{4} - \frac{A}{2} \right)$
  • D
    $\tan \left( \frac{\pi}{4} + \frac{A}{2} \right)$

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$\sqrt{2 + \sqrt{2 + 2\cos 4\theta}} = $

જો $\cos 40^\circ = x$ અને $\cos \theta = 1 - 2x^2$ હોય,તો $0^\circ$ અને $360^\circ$ ની વચ્ચે $\theta$ ના શક્ય મૂલ્યો કયા છે?

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