$n \in N$ के लिए,यदि $\cot ^{-1} 3+\cot ^{-1} 4+\cot ^{-1} 5+\cot ^{-1} n=\frac{\pi}{4}$ है,तो $n$ का मान ......... है।

  • A
    $70$
  • B
    $56$
  • C
    $10$
  • D
    $47$

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यदि $y = \tan^{-1}\sqrt{\frac{1 + \cos x}{1 - \cos x}}$ है,तो $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

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यदि $4 \sin ^{-1} x + 6 \cos ^{-1} x = 3 \pi$ है,तो $x = \ldots$.

यदि $\sin ^{-1} x+\sin ^{-1} y=\frac{\pi}{3}$ और $\cot ^{-1}\left(\frac{1}{x}\right)-\cot ^{-1}\left(\frac{1}{y}\right)=0$ है,तो $2 x^2+y^2-x y=$

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