यदि $\sin^4 \theta \cos^2 \theta = \sum_{n=0}^{\infty} a_{2n} \cos 2n \theta$ है,तो $n$ का न्यूनतम मान जिसके लिए $a_{2n} = 0$ है,होगा

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

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यदि $\cot \frac{2x}{3} + \tan \frac{x}{3} = \operatorname{cosec} \frac{kx}{3}$ है, तो $k$ का मान है

$\sin^{2}\left(\frac{\pi}{8}\right)$ का मान =

यदि $\theta = 3\alpha$ और $\sin \theta = \frac{a}{\sqrt{a^2 + b^2}}$ है,तो व्यंजक $a \csc \alpha - b \sec \alpha$ का मान क्या है?

$\cos x \cdot \cos 7 x - \cos 5 x \cdot \cos 13 x = $

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