જો $|\cos \theta \{\sin \theta + \sqrt{\sin^2 \theta + \sin^2 \alpha}\}| \le k$ હોય,તો $k$ નું મૂલ્ય શું થાય?

  • A
    $\sqrt{1 + \cos^2 \alpha}$
  • B
    $\sqrt{1 + \sin^2 \alpha}$
  • C
    $\sqrt{2 + \sin^2 \alpha}$
  • D
    $\sqrt{2 + \cos^2 \alpha}$

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$0 \le \alpha_1, \alpha_2, \dots, \alpha_n \le \frac{\pi}{2}$ અને $\cot \alpha_1 \cdot \cot \alpha_2 \cdots \cot \alpha_n = 1$ ની શરતો હેઠળ $\cos \alpha_1 \cdot \cos \alpha_2 \cdots \cos \alpha_n$ નું મહત્તમ મૂલ્ય શું છે?

Difficult
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ધારો કે $E = \left( {1 - \frac{{\cos 61^\circ}}{{\cos 1^\circ}}} \right) \left( {1 - \frac{{\cos 62^\circ}}{{\cos 2^\circ}}} \right) \dots \left( {1 - \frac{{\cos 119^\circ}}{{\cos 59^\circ}}} \right)$,તો $E$ ની કિંમત શોધો:

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