Particle Motion and Zero Velocity

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The position of a particle moving along the x-axis is given by $x(t) = 8e^{-2t} \sin(2t)$ for time $t > 0$ . What is the first time $t$ at which the velocity of the particle is zero?

$\frac{\pi}{8}$

$\frac{\pi}{4}$

$\frac{3\pi}{8}$

$\frac{\pi}{2}$

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