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

  • A
    $\frac{1}{{\sqrt 2 }}$
  • B
    $-\frac{1}{{\sqrt 2 }}$
  • C
    $\pm \sqrt{\frac{5}{2}}$
  • D
    $\pm \frac{1}{2}$

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$\sin ^{-1} \frac{4}{5} + 2 \tan ^{-1} \frac{1}{3}$ ની કિંમત 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.

$x=\frac{1}{5}$ હોય ત્યારે $\cos \left(2 \cos ^{-1} x+\sin ^{-1} x\right)$ ની કિંમત શોધો,જ્યાં $0 \leq \cos ^{-1} x \leq \pi$ અને $-\frac{\pi}{2} \leq \sin ^{-1} x \leq \frac{\pi}{2}$ છે.

જો $x \neq n \pi, x \neq(2 n+1) \frac{\pi}{2}, n \in Z$ હોય,તો $\frac{\sin ^{-1}(\cos x)+\cos ^{-1}(\sin x)}{\tan ^{-1}(\cot x)+\cot ^{-1}(\tan x)}$ ની કિંમત શું થાય?

જો $0 \leq x \leq \frac{1}{2}$ હોય,તો $\tan \left[\sin ^{-1}\left\{\frac{x}{\sqrt{2}}+\frac{\sqrt{1-x^{2}}}{\sqrt{2}}\right\}-\sin ^{-1} x\right]$ ની કિંમત શોધો.

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