If \( \mathrm{x} \) denotes displacement in time \( \mathrm{t} \) and \( \mathrm{x}=\mathrm{a} \...

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If \( \mathrm{x} \) denotes displacement in time \( \mathrm{t} \) and \( \mathrm{x}=\mathrm{a} \) cost then acceleration is :
(1) \( a \cos t \)
(2) \( -a \cos t \)
(3) \( a \sin t \)
(4) \( -a \sin t \)
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