यदि $\tan ^{-1}(x+2)+\tan ^{-1}(x-2)-\tan ^{-1}\left(\frac{1}{2}\right)=0$ है,तो $x$ का एक मान है

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

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$\cos ^{ - 1}\left( \frac{3 + 5\cos x}{5 + 3\cos x} \right)$ का मान क्या है?

Difficult
View Solution

$\cos \left[ 2\cos^{-1}\frac{1}{5} + \sin^{-1}\frac{1}{5} \right] = $

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