જો $f(n) = \tan^{-1} \left( \frac{e-1}{e^{-n} + e^{n+1}} \right)$ દરેક $n \in N$ માટે હોય,તો $\sum_{n=1}^\infty f(n)$ ની કિંમત શોધો.

  • A
    $\cot^{-1}(\frac{1}{e})$
  • B
    $\cot^{-1}(1)$
  • C
    $\tan^{-1}(\frac{2}{e})$
  • D
    $\tan^{-1}(\frac{1}{e})$

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કિંમત શોધો: $\cos ^{-1}\left(\frac{4}{5}\right)+\cos ^{-1}\left(\frac{12}{13}\right)$

જો $\tan ^{-1} 2 x+\tan ^{-1} 3 x=\frac{\pi}{4}$ હોય,તો $x$ ની કિંમત શોધો.

જો $0 < x < 1$ હોય,તો $y = \cos^{-1}\left(\frac{1-x^2}{1+x^2}\right)$ માટે $\frac{dy}{dx}$ શોધો.

જો $2 \tan^{-1}(\cos x) = \tan^{-1}(2 \operatorname{cosec} x)$ હોય,તો $x$ ની કિંમત શોધો.

વિધેય $\cos^{-1}(\sin x)$ નું $x$ ની સાપેક્ષમાં વિકલન કરો.

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