$\int \frac{\cos 2x}{\cos x} dx = $

  • A
    $2 \sin x + \log |\sec x + \tan x| + C$
  • B
    $2 \sin x - \log |\sec x - \tan x| + C$
  • C
    $2 \sin x - \log |\sec x + \tan x| + C$
  • D
    $2 \sin x + \log |\sec x - \tan x| + C$

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$\int \frac{1}{x\sqrt{x^2 - 1}} \, dx = $

$\int \frac{x^5+1}{x+1} \, dx = $ . . . . . . $+ c$.

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

यदि $f\left(\frac{2 x+3}{3 x+5}\right)=x+4$, जहाँ $x \neq \frac{-5}{3}, \frac{-2}{3}$, और $\int f(x) d x=A x+B \ln |3 x-2|+C$ है, तो $3 B-A=$

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