$2 \cos ^{-1} x = \sin ^{-1} \left( 2 x \sqrt{1 - x^2} \right)$ એ $x$ ની કઈ કિંમતો માટે સાચું છે?

  • A
    $0 \leq x \leq \frac{1}{\sqrt{2}}$
  • B
    $-1 \leq x \leq 1$
  • C
    $0 \leq x \leq 1$
  • D
    $\frac{1}{\sqrt{2}} \leq x \leq 1$

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શ્રેણી $\tan^{-1}\left(\frac{1}{3}\right) + \tan^{-1}\left(\frac{2}{9}\right) + \dots + \tan^{-1}\left(\frac{2^{n-1}}{1+2^{2n-1}}\right) + \dots$ ના અનંત પદોનો સરવાળો શોધો.

$\tan \left(\frac{\pi}{4}+\frac{1}{2} \cos ^{-1}\left(\frac{a}{b}\right)\right)+\tan \left(\frac{\pi}{4}-\frac{1}{2} \cos ^{-1}\left(\frac{a}{b}\right)\right)$ ની કિંમત શોધો.

જો $\cos ^{-1} 2x + \cos ^{-1} 3x = \frac{\pi}{3}$ અને $4x^2 = \frac{a}{b}$ હોય,તો $a + b =$

જો $ a + \frac{\pi}{2} < 2 \tan^{-1} x + 3 \cot^{-1} x < b $ હોય,તો $ a $ અને $ b $ ની કિંમતો શોધો.

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

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