Let z = g(x, y) = x² + xy³ -y - 6x - 2y +4, where x = r cos (8) and y = r sin(8). дz Use the chain rule to find az at (r, 0) =(√2, 7). ae Enter an integer or a fully reduced fraction such as -2, 7, -3/4, 41/7 etc. No spaces please

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