જો $\sin ^{-1} \frac{x}{5}+\sin ^{-1} \frac{4}{5}=\frac{\pi}{2}$ હોય,તો $x=$ . . . . . . .

  • A
    $3$
  • B
    $\frac{25}{4}$
  • C
    $4$
  • D
    $\frac{25}{3}$

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જો $f(x) = 2 \tan^{-1} x + \sin^{-1} \left( \frac{2x}{1 + x^2} \right)$,જ્યાં $x > 1$,તો $f(5)$ ની કિંમત શોધો:

$\cot \left(\sum_{n=1}^{23} \cot ^{-1}\left(1+\sum_{k=1}^n 2 k\right)\right)$ નું મૂલ્ય શોધો.

જો $\sin^{-1} x + \sin^{-1} y + \sin^{-1} z = \frac{\pi}{2}$ હોય,તો $x^2 + y^2 + z^2 + 2xyz$ ની કિંમત કેટલી થાય?

જો $y = \sec^{-1}\left( \frac{x + 1}{x - 1} \right) + \sin^{-1}\left( \frac{x - 1}{x + 1} \right)$ હોય,તો $\frac{dy}{dx} = $

$\cot \left(\sum\limits_{n=1}^{50} \tan ^{-1}\left(\frac{1}{1+n+n^{2}}\right)\right)$ ની કિંમત શોધો.

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