$\int \frac{3\cos x + 2\sin x}{4\sin x + 5\cos x} dx = A \{23x + 2\ln |4\sin x + 5\cos x|\} + c$ है,तो $A$ और $f(x)$ हैं

  • A
    $1/41, \log |x|$
  • B
    $1/41, \sin^{-1} x$
  • C
    $1/41, \log x$
  • D
    इनमें से कोई नहीं

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$\int \frac{dx}{(x+1) \sqrt{x^2+1}} = $

यदि $\int \frac{\sin x}{\sin (x-\alpha)} dx = px - q \log |\sin (x-\alpha)| + c$ है,तो $pq =$ . . . . . . .

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