यदि $A + B + C = 270^o$ है,तो $\cos 2A + \cos 2B + \cos 2C + 4\sin A \sin B \sin C = $

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    $3$

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यदि ${\sin ^3}x \sin 3x = \sum\limits_{m = 0}^n {{c_m} \cos mx} $ है,जहाँ ${c_0}, {c_1}, {c_2}, \dots, {c_n}$ स्थिरांक हैं और ${c_n} \ne 0$,तो $n$ का मान ज्ञात कीजिए।

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व्यंजक $\frac{\tan(x - \frac{\pi}{2}) \cdot \cos(\frac{3\pi}{2} + x) - \sin^3(\frac{7\pi}{2} - x)}{\cos(x - \frac{\pi}{2}) \cdot \tan(\frac{3\pi}{2} + x)}$ का सरलीकृत रूप क्या है?

$\frac{{\sin \theta }}{{1 - \cot \theta }} + \frac{{\cos \theta }}{{1 - \tan \theta }} = $

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