9. Let f(x, y) = x² - 5xy a. Find the gradient of f(x, y) b. Find the directional derivative at (2,1) in the direction of = −i + 3j c. Find the equation of the tangent line on f(x, y) at (2,1) - hint: the coefficient on the x should be 1 d. Find the linearization L(x, y) off at (2,1) e. Use the linearization to approximate f(1.9,.9)

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