Differentiate y = (2x + 1)°(x³ – x + 1)*. Solution: In this example we must use the Product Rule before using the Chain Rule: dy (2.x + 1) d (x³ – x + 1)* + (x³ – x + 1) · dx d (2x + 1) dx || dx d = (2x + 1) • 4(x³ – x + 1)³ (x³ – x + 1) dx

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