Given the function f(x, y) = cos x · cos y a. Find the directional derivative of f(x, y) at the point P(?/4, ?/4) in the direction of vector v = 3i + 4j b. Find the maximum value of the rate of change of f(x, y) at P(?/4, ?/4)
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Given vector v = 3i + 4j, the magnitude of v is sqrt(3^2 + 4^2) = 5. The unit vector u in the direction of v is 1/5 * (3i + 4j) = 3/5i + 4/5j. Show more…
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