જો $a > b > 0$ અને $\sec^{-1} \left( \frac{a+b}{a-b} \right) = 2 \sin^{-1} x$ હોય,તો $x$ ની કિંમત શોધો.

  • A
    $-\sqrt{\frac{b}{a+b}}$
  • B
    $\sqrt{\frac{b}{a+b}}$
  • C
    $-\sqrt{\frac{a}{a+b}}$
  • D
    $\sqrt{\frac{a}{a+b}}$

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$4 \tan ^{-1} \frac{1}{5}-\tan ^{-1} \frac{1}{70}+\tan ^{-1} \frac{1}{99}=$

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સાબિત કરો કે $3 \sin ^{-1} x = \sin ^{-1}(3 x - 4 x^{3})$,જ્યાં $x \in [-\frac{1}{2}, \frac{1}{2}]$.

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

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