As for your other problem.
Differentiate.
v(t) = 2 * - sin(2t)
now substitute the angle.
sin(pi() /2 ) = 1
v(pi()/4) = 2 * -1 = -2
dgrgr
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As for your other problem.
Differentiate.
v(t) = 2 * - sin(2t)
now substitute the angle.
sin(pi() /2 ) = 1
v(pi()/4) = 2 * -1 = -2
dgrgr