જો $\tan ^{-1}(2 x)+\tan ^{-1}(3 x)=\frac{\pi}{4}$,જ્યાં $x>0$,તો $x=$

  • A
    $1$
  • B
    $\frac{1}{6}$
  • C
    $\frac{1}{3}$
  • D
    $\frac{1}{2}$

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શ્રેણી $\cot^{-1} 3 + \cot^{-1} 7 + \cot^{-1} 13 + \cot^{-1} 21 + \dots$ ના પ્રથમ $n$ પદોનો સરવાળો શું થાય?

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$\frac{d}{dx} \left( \cos^{-1} \sqrt{\frac{1 + \cos x}{2}} \right) = $

જો $\cos^{-1} x - \cos^{-1} \frac{y}{2} = \alpha$ હોય,તો $4x^2 - 4xy \cos \alpha + y^2$ ની કિંમત શોધો.

જો $\cos^{-1} x + \cos^{-1} y = 2\pi$ હોય,તો $\sin^{-1} x + \sin^{-1} y$ ની કિંમત શોધો.

જો $\tan ^{-1}\left(\frac{1-x}{1+x}\right)-\frac{1}{2} \tan ^{-1} x=0$,$x>0$ માટે,તો $x=$

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