$\cos \left[ {{\tan }^{ - 1}}\frac{1}{3} + {{\tan }^{ - 1}}\frac{1}{2} \right] = $

  • A
    $\frac{1}{{\sqrt 2 }}$
  • B
    $\frac{{\sqrt 3 }}{2}$
  • C
    $\frac{1}{2}$
  • D
    $\frac{\pi }{4}$

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यदि $a=\sin ^{-1}(\sin (5))$ और $b=\cos ^{-1}(\cos (5))$ है,तो $a^2+b^2$ का मान ज्ञात कीजिए।

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?

$\cot ^{-1}\left(2 \cdot 1^2\right)+\cot ^{-1}\left(2 \cdot 2^2\right)+\cot ^{-1}\left(2 \cdot 3^2\right)+\ldots \ldots \ldots \infty =$

$\tan^{-1} \left( \frac{\sin 2 - 1}{\cos 2} \right)$ का मान ज्ञात कीजिए:

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