यदि $0 \leq \theta \leq 2 \pi$,$0 \leq \alpha \leq 2 \pi$ और $\sec ^{2018} \theta + \operatorname{cosec}^{2018} \alpha = 2$ है,तो $\cos ^{2020} \theta + \sin ^{2022} \alpha$ का मान ज्ञात कीजिए।

  • A
    $1/2$
  • B
    $1/2^{2020}$
  • C
    $1$
  • D
    $2$

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$\left( {1 + \cos \frac{\pi }{8}} \right)\,\left( {1 + \cos \frac{{3\pi }}{8}} \right)\,\left( {1 + \cos \frac{{5\pi }}{8}} \right)\,\left( {1 + \cos \frac{{7\pi }}{8}} \right) = $

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$\sin 10^\circ + \sin 20^\circ + \sin 30^\circ + \dots + \sin 360^\circ$ का मान क्या है?

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