The displacement,
y(m), of a body in damped oscillation is y=2e^-t sin sin 3t .
The task is to:
1.
"=2\\sin(3t)\\dfrac{d}{dt}(e^{-t})+2e^{-t}\\dfrac{d}{dt}(\\sin(3t))"
"=2\\sin(3t)e^{-t}\\dfrac{d}{dt}(-t)+2e^{-t}\\cos(3t)\\dfrac{d}{dt}(3t)"
"=-2\\sin(3t)e^{-t}+6e^{-t}\\cos(3t)"
"=2e^{-t}(-\\sin(3t)+3\\cos(3t))"
"v=\\dfrac{dy}{dt}=2e^{-t}(-\\sin(3t)+3\\cos(3t))"
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