Answer
$s'=\frac{12}{3π}cos(3t)-\frac{4}{π}sin(5t)$
Work Step by Step
Take the derivative and apply chain rule:
$s'=\frac{4}{3π}cos(3t)\times3-\frac{4}{5π}sin(5t)\times5=\frac{12}{3π}cos(3t)-\frac{4}{π}sin(5t)$
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