यदि $A + B + C = 180^o$ है,तो $(\cot B + \cot C)(\cot C + \cot A)(\cot A + \cot B)$ का मान क्या होगा?

  • A
    $\sec A \sec B \sec C$
  • B
    $\csc A \csc B \csc C$
  • C
    $\tan A \tan B \tan C$
  • D
    $1$

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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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