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

  • A
    $2 \cos \theta$
  • B
    $\frac{\cos \theta}{2}$
  • C
    $\frac{\cos \theta}{\sqrt{2}}$
  • D
    $\sqrt{2} \cdot \cos \theta$

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$\cot \theta - \tan \theta - 2 \tan 2 \theta - 4 \tan 4 \theta = $

$\tan 7\frac{1}{2}^\circ$ का मान किसके बराबर है?

Difficult
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यदि सर्वसमिका $\cos^4 \theta = a \cos 4\theta + b \cos 2\theta + c$ कुछ $a, b, c \in \mathbb{Q}$ के लिए सत्य है,तो $(a, b, c) =$

यदि $2\cos^2 \theta - 2\sin^2 \theta = 1$ है,तो $\theta = \dots ^\circ$.

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