यदि $\sin x + \sin^2 x = 1$ है,तो $\cos^{12} x + 3\cos^{10} x + 3\cos^8 x + \cos^6 x - 2$ का मान क्या होगा?

  • A
    $0$
  • B
    $1$
  • C
    $-1$
  • D
    $2$

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यदि $\sum_{r=1}^{50} \tan ^{-1} \frac{1}{2 r^{2}}=p$ है,तो $\tan p$ का मान क्या है?

$\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) = $

$\cos^2 76^{\circ} + \cos^2 16^{\circ} - \cos 76^{\circ} \cos 16^{\circ}$ का मान ज्ञात कीजिए।

समीकरणों $\sin x + \sin y = \sin(x + y)$ और $|x| + |y| = 1$ को संतुष्ट करने वाले क्रमित युग्मों $(x, y)$ की संख्या है

यदि $\cos \alpha = \frac{l \cos \beta + m}{l + m \cos \beta}$ है,तो $\left(\frac{\tan \frac{\alpha}{2}}{\tan \frac{\beta}{2}}\right)^2 = $

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