यदि $\tan ^{-1}\left(\frac{x-1}{x-2}\right)+\tan ^{-1}\left(\frac{x+1}{x+2}\right)=\frac{\pi}{4}$ है,तो $x$ के मान ज्ञात कीजिए।

  • A
    $\pm \frac{3}{\sqrt{2}}$
  • B
    $\pm \frac{1}{2}$
  • C
    $\pm \frac{1}{\sqrt{2}}$
  • D
    $\pm \frac{\sqrt{3}}{2}$

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यदि $\cos ^{-1} x - \cos ^{-1} \frac{y}{2} = \alpha$,जहाँ $-1 \leq x \leq 1, -2 \leq y \leq 2, x \leq \frac{y}{2}$ है,तो सभी $x, y$ के लिए $4x^2 - 4xy \cos \alpha + y^2$ का मान क्या होगा?

यदि त्रिभुज $ABC$ में $\angle A = 90^\circ$ है,तो $\tan^{-1}\left(\frac{c}{a+b}\right) + \tan^{-1}\left(\frac{b}{a+c}\right) = $

$\tan^{-1}\left(\frac{1}{11}\right) + \tan^{-1}\left(\frac{2}{12}\right) = $

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यदि $\frac{\pi}{2} \leq x \leq \frac{3 \pi}{4}$ है,तो $\cos ^{-1}\left(\frac{12}{13} \cos x+\frac{5}{13} \sin x\right)$ का मान ज्ञात कीजिए।

समीकरण $2 \operatorname{Cos}^{-1} x + \operatorname{Sin}^{-1} x = \frac{11 \pi}{6}$ के हलों की संख्या है

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