$\cot \left( \sum\limits_{r = 1}^\infty \tan^{-1} \left( \frac{4}{4r^2 + 3} \right) \right)$ का मान किसके बराबर है?

  • A
    $1$
  • B
    $\frac{1}{2}$
  • C
    $2$
  • D
    $\frac{1}{4}$

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$\cos \left(2 \left(\tan ^{-1} \frac{1}{5}+\tan ^{-1} 5\right)\right) = $ . . . . . .

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यदि $\sin^{-1} x + \sin^{-1} y + \sin^{-1} z = \frac{\pi}{2}$ है,तो $x^2 + y^2 + z^2 + 2xyz$ का मान क्या होगा?

समीकरण $2 \operatorname{Cos}^{-1} x + \operatorname{Sin}^{-1} x = \frac{11 \pi}{6}$ के हलों की संख्या है

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