यदि $\int \frac{\cos x+x}{1+\sin x} d x=f(x)+\int \frac{3 \cos \frac{x}{2}-\sin \frac{x}{2}}{\cos \frac{x}{2}+\sin \frac{x}{2}} d x+c_r$ है, तो $f(x)=$

  • A
    $\frac{-2 x}{1+\tan \frac{x}{2}}$
  • B
    $\frac{-x \cos \frac{x}{2}}{\cos \frac{x}{2}+\sin \frac{x}{2}}$
  • C
    $\frac{2 x}{1+\tan \frac{x}{2}}$
  • D
    $\frac{x \cos \frac{x}{2}}{\cos \frac{x}{2}+\sin \frac{x}{2}}$

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यदि $f(x) = \frac{\sin^2 \pi x}{1+\pi^x}$ है,तो $\int (f(x) + f(-x)) \, dx$ का मान ज्ञात कीजिए।

$\int (1+\tan^2 x)(1+2x \tan x) dx =$

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