For the following exercises, find the directional derivative of the function in the direction of the unit vector \(\mathbf{u}=\cos \theta i+\sin \theta \mathbf{j}\).

\(f(x,\ y)=\ln(x+2y),\quad\theta\ =\frac{\pi}{3}\)

Text Transcription:

f(x,\ y)=\ln(x+2y),\quad\theta\ =\frac{\pi}{3}

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