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Skill check: Tangents, motion, and critical points

The position of a particle moving along a number line is given by
s(t)=sin(t)s(t)=\sin(t),
where t0t\ge0 is the elapsed time in seconds.
In the first 2π2\pi seconds of motion, when is the particle speeding up?
Choose all answers that apply:
Choose all answers that apply: