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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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.

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

$x$ ની સાપેક્ષમાં $\tan^{-1}\left(\frac{\sqrt{1+x^2}-1}{x}\right)$ નું વિકલન શોધો:

જો $\cos (2\sin ^{ - 1}x) = \frac{1}{9}$ હોય,તો $x = $

જો ${x_1}, {x_2}, {x_3}, {x_4}$ એ સમીકરણ ${x^4} - {x^3}\sin 2\beta + {x^2}\cos 2\beta - x\cos \beta - \sin \beta = 0$ ના બીજ હોય,તો ${\tan ^{ - 1}}{x_1} + {\tan ^{ - 1}}{x_2} + {\tan ^{ - 1}}{x_3} + {\tan ^{ - 1}}{x_4} = $

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