If the general solution of $\sin 5x = \cos 2x$ is of the form $x = a_n \cdot \frac{\pi}{2}$ for $n = 0, \pm 1, \pm 2, \dots$,then $a_n =$

  • A
    $\frac{2n}{5+2(-1)^n}$
  • B
    $\frac{2n+(-1)^n}{5+2(-1)^n}$
  • C
    $\frac{2n+1}{5+2(-1)^n}$
  • D
    $\frac{2n-1}{5+2(-1)^n}$

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