Answer
$s'=cos(\frac{3πt}{2})\times3π/2-sin(\frac{3πt}{2})\times3π/2$
Work Step by Step
Take the derivative and apply the chain rule:
$s'=cos(\frac{3πt}{2})\times3π/2-sin(\frac{3πt}{2})\times3π/2$
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