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

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

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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 $9x^2 - 6xy \cos \alpha + y^2$ ની કિંમત શું થાય?

જો $\tan ^{-1} 2 x+\tan ^{-1} 3 x=\frac{\pi}{4}$ હોય,તો $x$ ની કિંમત શોધો.

સમીકરણ $2\cos^{-1}x + \sin^{-1}x = \frac{11\pi}{6}$ ને

$2 \tan ^{-1} \frac{1}{2} + \tan ^{-1} \frac{3}{8}$ નું મૂલ્ય શું છે?

જો $f(n) = \tan^{-1} \left( \frac{e-1}{e^{-n} + e^{n+1}} \right)$ દરેક $n \in N$ માટે હોય,તો $\sum_{n=1}^\infty f(n)$ ની કિંમત શોધો.

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