यदि $2\tan^{-1}(\cos x) = \tan^{-1}(2\csc x)$ है,तो $x =$

  • A
    $\frac{3\pi}{4}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{3}$
  • D
    इनमें से कोई नहीं

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$\sum_{i=0}^2 \cot ^{-1}\{-(i+1)\}=$ . . . . . . .

यदि $A=2 \tan ^{-1}\left(\frac{1+x}{1-x}\right)$ और $B=\cos ^{-1}\left(\frac{1-x^2}{1+x^2}\right)$,जहाँ $x \in(0,1)$,तो $A-B=$

$\sin [\cot ^{ - 1}(\cos \tan ^{ - 1}x)] =$

यदि $x \in [-1/2, 1/2]$ के लिए $y = 3 \sin^{-1}x + \sin^{-1}(3x - 4x^3)$ है, तो

$\sin \left[3 \sin ^{-1}(0.4)\right] = \ldots$

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