જો $\frac{1}{2} \sin^{-1}\left(\frac{3 \sin 2\theta}{5+4 \cos 2\theta}\right) = \tan^{-1} x$ હોય,તો $x =$

  • A
    $\tan \frac{\theta}{3}$
  • B
    $\frac{1}{3} \tan \theta$
  • C
    $\tan 3\theta$
  • D
    $\frac{1}{3} \tan 3\theta$

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${\sin ^{ - 1}}\frac{4}{5} + 2{\tan ^{ - 1}}\frac{1}{3} = $

જો $-1 < x < 1$ અને $x \neq 0$ માટે $\tan ^{-1}\left(\frac{2 x}{1-x^2}\right)+\cot ^{-1}\left(\frac{1-x^2}{2 x}\right)=\frac{\pi}{3}$ ના તમામ ઉકેલોનો સરવાળો $\alpha-\frac{4}{\sqrt{3}}$ હોય,તો $\alpha$ ની કિંમત $..........$ થાય.

જો $\frac{\sin ^{-1} x}{a}=\frac{\cos ^{-1} x}{b}=\frac{\tan ^{-1} y}{c}$ અને $0 < x < 1$ હોય,તો $\cos \left(\frac{\pi c}{a + b}\right)$ ની કિંમત શોધો.

જો $\alpha \leq 2 \sin^{-1} x + \cos^{-1} x \leq \beta$ હોય,તો

$2{\tan ^{ - 1}}\left[ {\sqrt {\frac{{a - b}}{{a + b}}} \tan \frac{\theta }{2}} \right] = $

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