$\int x \sin kx \, dx$ का मान क्या है?

  • A
    $\frac{\sin kx}{k} + c$
  • B
    $\frac{\cos kx}{k} + c$
  • C
    $\frac{\sin x}{k} + c$
  • D
    $-\frac{x \cos kx}{k} + \frac{\sin kx}{k^2} + c$

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