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) Consider the function f(x,y)=−2x^2−y^2. Find the the directional derivative of ff at the point (1,−3)(1,−3)...

) Consider the function f(x,y)=−2x^2−y^2.
Find the the directional derivative of ff at the point (1,−3)(1,−3) in the direction given by the angle θ=π/2.

Find the unit vector which describes the direction in which ff is increasing most rapidly at (1,−3).

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