यदि $(n - m)$ विषम है और $|m| \ne |n|,$ तो $\int_0^\pi {\cos mx \sin nx} \,dx$ का मान क्या है?

  • A
    $\frac{2n}{n^2 - m^2}$
  • B
    $0$
  • C
    $\frac{2n}{m^2 - n^2}$
  • D
    $\frac{2m}{n^2 - m^2}$

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