In equation $y=x^2 \cos ^2 2 \pi \frac{\beta \gamma}{\alpha}$, the units of $x, \alpha, \beta$ are $m , s ^{-1}$ and $\left( ms ^{-1}\right)^{-1}$ respectively. The units of $y$ and $\gamma$ are

  • A
    $m ^2, ms ^{-2}$
  • B
    $m , ms ^{-1}$
  • C
    $m^2, m$
  • D
    $m , ms ^{-2}$

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