$\int \frac{3\cos x + 2\sin x}{4\sin x + 5\cos x} dx = A \{23x + 2\ln |4\sin x + 5\cos x|\} + c$ 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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यदि $\int f(x) \cos x \, dx = \frac{1}{2} [f(x)]^2 + C$ और $f(0) = 0$ है, तो $f'(0) = $

$\int \sqrt{x^2-8 x+7} \, dx = $ . . . . . . $+ C$.

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