यदि $\cos ^{-1} 2x + \cos ^{-1} 3x = \frac{\pi}{3}$ और $4x^2 = \frac{a}{b}$ है,तो $a + b =$

  • A
    $12$
  • B
    $11$
  • C
    $31$
  • D
    $10$

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मान ज्ञात कीजिए: $\operatorname{cosec}^{-1}\left[\left(\frac{\tan ^2\left(\frac{\alpha-\pi}{4}\right)-1}{\tan ^2\left(\frac{\alpha-\pi}{4}\right)+1}+\cos \frac{\alpha}{2} \cdot \cot 5 \alpha\right) \sec \frac{11 \alpha}{2}\right]$

$x > 0$ के लिए $\tan ^{-1} \frac{1-x}{1+x}=\frac{1}{2} \tan ^{-1} x$ को हल करें।

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मान ज्ञात कीजिए: $\sin^{-1}(12/13) + \cos^{-1}(4/5) + \tan^{-1}(63/16) = $

यदि $y = \tan^{-1} \frac{x}{1+2x^2} + \tan^{-1} \frac{x}{1+6x^2} + \tan^{-1} \frac{x}{1+12x^2}$ है,तो $\left(\frac{dy}{dx}\right)_{x=\frac{1}{2}} = $

$\cot^{-1} \left[ \frac{\sqrt{1 - \sin x} + \sqrt{1 + \sin x}}{\sqrt{1 - \sin x} - \sqrt{1 + \sin x}} \right]$ का मान क्या है, जहाँ $x \in (0, \frac{\pi}{2})$ है?

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