Determine the angular acceleration of link ABAB if link CDCD has the angular velocity CDCD $=1\mathrm{.}8$ rad$/$srad$/$s and angular deceleration CDCD $=3\mathrm{.}6$ rad$/$s$2$rad$/$s$2$ shown in $($Figure $1).$ Assume the counterclockwise rotation as positive.

Express your answer to three significant figures and include the appropriate units.

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ABAB $=$

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