# Find \frac{dy}{dx} and \frac{d^2y}{dx^2}.x=e^t,y=te^{-t}. For which values of

Find $\frac{dy}{dx}$ and $\frac{{d}^{2}y}{{dx}^{2}}.x={e}^{t},y=t{e}^{-t}$. For which values of t is the curve concave upward?
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