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

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

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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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જો $\cos ^{-1} x+\cos ^{-1} y+\cos ^{-1} z=3 \pi$ હોય,તો $x^{2025}+x^{2026}+x^{2027}$ ની કિંમત શોધો.

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