Find the directional derivative of f at P in the direction of a vector making the counterclockwise angle 60 with the positive x-axis. f (x, y) = 5/ry; P(1,4); 0 = - 3 NOTE: Enter the exact answer. Duf =

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A: I am attaching image so that you understand each and every step.

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Q: 3- use Cramer's rule to solve the system 8x1-4x2+3x3=0 X1+5x2-X3=0 -2x1+6x2+X3=0

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