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

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