જો $0 < x < 1$ હોય,તો $y = \cos^{-1}\left(\frac{1-x^2}{1+x^2}\right)$ માટે $\frac{dy}{dx}$ શોધો.

  • A
    $\frac{2}{1+x^2}$
  • B
    $\frac{1}{1+x^2}$
  • C
    $\frac{-2}{1+x^2}$
  • D
    $\frac{-1}{1+x^2}$

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જો $0 < x < \frac{1}{2}$ અને $\alpha = \sin^{-1} x + \cos^{-1} \left( \frac{x}{2} + \frac{\sqrt{3 - 3 x^2}}{2} \right)$ હોય,તો $\tan \alpha + \cot \alpha =$

$\cos ^{-1}\left\{\cot \left(\sum_{i=1}^3 \cot ^{-1} i\right)\right\}=$ . . . . . . .

$\cos \left[ 2\cos^{-1}\frac{1}{5} + \sin^{-1}\frac{1}{5} \right] = $

જો $\cos ^{-1} x-\cos ^{-1} \frac{y}{3}=\alpha$,જ્યાં $-1 \leq x \leq 1$,$-3 \leq y \leq 3$,અને $x \leq \frac{y}{3}$ હોય,તો તમામ $x, y$ માટે $9 x^2-6 x y \cos \alpha+y^2$ ની કિંમત શોધો.

$\cos \left(\tan ^{-1}\left(\sin \left(\cot ^{-1} x\right)\right)\right)$ નું મૂલ્ય શું છે?

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