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Calculate the partial derivative of F with respect to u, where F(x,y) = f(u,v), u = x + 3y, and v = 2x - y. The vector u is (1,1). The gradient of...

Calculate the partial derivative of F with respect to u, where F(x,y) = f(u,v), u = x + 3y, and v = 2x - y. The vector u is (1,1).

The gradient of F at (0,0) is (-2,15).
The unit vector of u is (√2/2, √2/2).
The partial derivative of F with respect to u is 13√2/2.