જો $\tan ^{-1}\left(\frac{x+1}{x-1}\right)+\tan ^{-1}\left(\frac{x-1}{x}\right)=\tan ^{-1}(-7)$ હોય,તો $x$ ની કિંમત શોધો.

  • A
    -$1$
  • B
    $1$
  • C
    $2$
  • D
    $4$

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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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જો $x \in \left(0, \frac{1}{4}\right)$ માટે,$\tan^{-1}\left(\frac{6x\sqrt{x}}{1-9x^3}\right)$ નું વિકલન $\sqrt{x} \cdot g(x)$ હોય,તો $g(x)$ ની કિંમત શોધો.

$\tan ^{-1} 2+\tan ^{-1} 3=$

$\sin [\cot ^{ - 1}(\cos \tan ^{ - 1}x)] =$

જો $\cot ^{-1}(7)+\cot ^{-1}(8)+\cot ^{-1}(18)=\cot ^{-1} x$ હોય,તો $x$ ની કિંમત શોધો.

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