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An $\text{OP-AMP}$ is used as a zero-crossing detector. If the maximum output available from the $\text{OP-AMP}$ is $\pm 12 \mathrm{~V} \; p – p$, and the slew rate of the $\text{OP-AMP}$ is $12 \mathrm{~V} / \mu \mathrm{sec}$, then the maximum frequency of the input signal that can be applied without causing a reduction in the $p – p$ output is
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