The oscillation of a body on a smooth horizonatal surface is represented by the equation, $X = A \cot (\omega t)$ <br> where, $X$ = displacement at time $t$ <br> $\omega$ = frequency of oscillation <br> Which one of the following graph shows correctly the variation $'a'$ with $'t'$ ? <br> Here a = acceleration at time t <br> T = time period

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