यदि $\sin x+\sin ^2 x=1$,जहाँ $x \in\left(0, \frac{\pi}{2}\right)$,तो $(\cos ^{12} x+\tan ^{12} x)+3(\cos ^{10} x+\tan ^{10} x+\cos ^8 x+\tan ^8 x)+(\cos ^6 x+\tan ^6 x)$ का मान ज्ञात कीजिए।

  • A
    $4$
  • B
    $3$
  • C
    $2$
  • D
    $1$

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यदि $\tanh x = \operatorname{sech} y = \frac{3}{5}$ और $e^{x+y}$ एक पूर्णांक है,तो $e^{x+y} =$

$\cos ^2 10^{\circ}+\cos ^2 50^{\circ}-\sin 40^{\circ} \sin 80^{\circ}$ का मान ज्ञात कीजिए।

माना $S = \{ \theta \in [0, 4\pi] : \tan^2 \theta \neq 1 \}$ और $S = \{ a \in \mathbb{Z} : 2(\cos^8 \theta - \sin^8 \theta) \sec 2\theta = a^2, \theta \in S \}$ है। तो $n(S)$ है:

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