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OpenStudy (anonymous):
Find the directional derivative of f(x, y)=x^2*y+4y^2 at (2, 1) for u=<1/2, sqrt(3)/2>. The gradient is <2xy, 8y> at (2, 1)=<4, 8> <4, 8>*<1/2, sqrt(3)/2>=2+4sqrt(3) Am I right? If not, correct me through steps.
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