જો $\sec^{-1} x = \csc^{-1} y$ હોય,તો $\cos^{-1} \frac{1}{x} + \cos^{-1} \frac{1}{y} = $

  • A
    $\pi$
  • B
    $\frac{\pi}{4}$
  • C
    $-\frac{\pi}{2}$
  • D
    $\frac{\pi}{2}$

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જો $\cos ^{-1} x - \cos ^{-1} \frac{y}{2} = \alpha$,જ્યાં $-1 \leq x \leq 1, -2 \leq y \leq 2, x \leq \frac{y}{2}$ હોય,તો તમામ $x, y$ માટે $4x^2 - 4xy \cos \alpha + y^2$ ની કિંમત શું થાય?

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જો $\cos^{-1} x - \cos^{-1} \frac{y}{2} = \alpha$ હોય,તો $4x^2 - 4xy \cos \alpha + y^2$ ની કિંમત શોધો.

$x$ ની કઈ કિંમત $\sin \left(\cot ^{-1} x\right)=\cos \left(\tan ^{-1}(1+x)\right)$ નું સમાધાન કરે છે?

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