કિંમત શોધો: $\cos ^{-1}\left(\frac{4}{5}\right)+\cos ^{-1}\left(\frac{12}{13}\right)$

  • A
    $\cos ^{-1}\left(\frac{24}{25}\right)$
  • B
    $\cos ^{-1}\left(\frac{33}{65}\right)$
  • C
    $\cos ^{-1}\left(\frac{5}{13}\right)$
  • D
    $\cos ^{-1}\left(\frac{3}{5}\right)$

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ધારો કે $a_1=1, a_2, a_3, a_4, \ldots$ ક્રમિક પ્રાકૃતિક સંખ્યાઓ છે. તો $\tan ^{-1}\left(\frac{1}{1+ a _1 a _2}\right)+\tan ^{-1}\left(\frac{1}{1+ a _2 a _3}\right)+\ldots+\tan ^{-1}\left(\frac{1}{1+ a _{2021} a _{2022}}\right)$ ની કિંમત શોધો.

જો $(\tan^{-1} x)^2 + (\cot^{-1} x)^2 = \frac{5\pi^2}{8}$ હોય,તો $x$ =

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જો $\tan^{-1}x + \tan^{-1}y + \tan^{-1}z = \pi$ હોય,તો $x + y + z$ ની કિંમત શું થાય?

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?

$\frac{d}{dx} \left( \cos^{-1} \sqrt{\frac{1 + \cos x}{2}} \right) = $

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