यदि $a \tan \theta = b$ है,तो $a \cos 2\theta + b \sin 2\theta = $

  • A
    $a$
  • B
    $b$
  • C
    $-a$
  • D
    $-b$

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$\tan 20^\circ \tan 40^\circ \tan 60^\circ \tan 80^\circ = $

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यदि $\frac{3\pi}{4} < \alpha < \pi$ है,तो $\sqrt{\csc^2 \alpha + 2\cot \alpha}$ का मान ज्ञात कीजिए।

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