$\tan^{-1} \frac{1}{2} + \tan^{-1} \frac{1}{3} = ?$

  • A
    $0$
  • B
    $\pi / 4$
  • C
    $\pi / 2$
  • D
    $\pi$

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જો $\sin ^{-1} x+\sin ^{-1} y+\sin ^{-1} z=\frac{3 \pi}{2}$ હોય, તો $x^{9}+y^{9}+z^{9}-\frac{1}{x^{9} y^{9} z^{9}}$ ની કિંમત કેટલી થાય?

$\tan ^{-1}(x+1)+\cot ^{-1}\left(\frac{1}{x-1}\right)=\tan ^{-1}\left(\frac{8}{31}\right)$ માટે $x$ ના શક્ય મૂલ્યોનો સરવાળો કેટલો થાય?

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સાબિત કરો કે $\tan ^{-1}\left(\frac{\sqrt{1+x}-\sqrt{1-x}}{\sqrt{1+x}+\sqrt{1-x}}\right)=\frac{\pi}{4}-\frac{1}{2} \cos ^{-1} x$,જ્યાં $-\frac{1}{\sqrt{2}} \leq x \leq 1$.

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