कुछ $a, b, c \in R$ के लिए,यदि $\sin 5 \theta = a \cos^4 \theta \sin \theta + b \cos^2 \theta \sin^3 \theta + c \sin^5 \theta$ है,तो $abc =$

  • A
    -$10$
  • B
    $10$
  • C
    $0$
  • D
    -$50$

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यदि $\tan \left(\frac{x}{2}\right) = \frac{m}{n}$ है,तो $m \sin (x) + n \cos (x)$ का मान किसके बराबर है?

यदि $\cos^3 \theta + \cos^3 \left(\frac{2 \pi}{3} + \theta\right) + \cos^3 \left(\frac{4 \pi}{3} + \theta\right) = \alpha \cos 3 \theta$ है,तो $\alpha$ का मान ज्ञात कीजिए।

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

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