For f(x) = 3x2, find du using the definition, Δε dy dx lim Δε Δε 20 Δε Δε (a) First, evaluate Δy = f(x + Δz) - f(x) and express it in the form Δy = L(x, Δπ) - Δπ. Use dr to represent Δι Ag= (b) Using the L(x, Az) Az above, find the simplified derivative Δy lim dy dz lim f(x + Δz) = f(x) Δε Δy lim Δε 0 Δε

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