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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Similar Questions

$\tan \left[2 \tan ^{-1}\left(\frac{1}{5}\right)-\frac{\pi}{4}\right]$ નું મૂલ્ય શોધો.

$\tan ^{-1}(1)+\cos ^{-1}\left(-\frac{1}{2}\right)+\sin ^{-1}\left(-\frac{1}{2}\right)$ નું મૂલ્ય શોધો.

$2 \tan ^{-1} \frac{1}{5}+\sec ^{-1} \frac{5 \sqrt{2}}{7}+2 \tan ^{-1} \frac{1}{8}=$

જો ${\cot ^{ - 1}}\frac{n}{\pi } > \frac{\pi }{6},\,\,n \in N$ હોય,તો $n$ ની મહત્તમ કિંમત કેટલી થાય?

ધારો કે $S = \{x \in R : 0 < x < 1 \text{ અને } 2 \tan^{-1}\left(\frac{1-x}{1+x}\right) = \cos^{-1}\left(\frac{1-x^2}{1+x^2}\right)\}$. જો $n(S)$ એ $S$ માં રહેલા ઘટકોની સંખ્યા દર્શાવતું હોય,તો:

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