यदि $\sin ^{-1} \frac{x}{5}+\sin ^{-1} \frac{4}{5}=\frac{\pi}{2}$ है,तो $x=$ . . . . . . .

  • A
    $3$
  • B
    $\frac{25}{4}$
  • C
    $4$
  • D
    $\frac{25}{3}$

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यदि $2 \tan^{-1}(\cos x) = \tan^{-1}(2 \operatorname{cosec} x)$ है,तो $x$ का मान ज्ञात कीजिए।

यदि $\sum_{n=1}^k \tan ^{-1}\left(\frac{1}{n^2+3 n+3}\right)=\tan ^{-1} \alpha$ है, तो $\alpha=$

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