"\\dfrac{dy}{dt}=\\dfrac{d(2e^{-t})}{dt}\\sin3t+2e^{-t}\\dfrac{d(\\sin3t)}{dt}=\n-2e^{-t}\\sin3t+2e^{-t}\\cdot 3\\cos3t=2e^{-t}(-\\sin 3t+3\\cos 3t)"
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