# Find the directional derivative of f at the given point in the direction indicated by the angle theta. f(x,y)=ye^{-x}, (0,4), \theta=\frac{2\pi}{3}

Find the directional derivative of f at the given point in the direction indicated by the angle theta. $f\left(x,y\right)=y{e}^{-x},\left(0,4\right),\theta =\frac{2\pi }{3}$
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