and y = g(u) dy/dx = dy/du * du/dx y = log3(u) u = x^2 + 6x dy/dx = 1/ln3 * 1/u * du/dx = 1/ln3 * 1/(x^2 + 6x) * (2x+6) = (2x+6)/(ln 3 * (x^2 + 6x))
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