$\int \frac{\cos x+x \sin x}{x(x+\cos x)} d x = \_\_\_\_$

  • A
    $\log \left|\frac{x \sin x}{x+\cos x}\right|+c$
  • B
    $\log \left|\frac{x}{x+\cos x}\right|+c$
  • C
    $\log |\cos x+x \sin x|+c$
  • D
    $\log \left|x^2+x \cos x\right|+c$

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$\int \frac{\sec^2 x}{(1 + \tan x)(2 + \tan x)} \, dx$ का मूल्यांकन करने के लिए,सबसे उपयुक्त प्रतिस्थापन (substitution) क्या है?

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