Use Theorem 13.9 to find the directional derivative of the function at P in the direction of the unit vector u=cosθi+5si
Posted: Thu Jul 14, 2022 4:30 pm
by answerhappygod
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Use Theorem 13.9 to find the directional derivative of the function at P in the direction of the unit vector u=cosθi+5sinθj. f(x,y)=2x+yy,P(2,0),θ=−6π+