Just as there are times when the erroneous version of the product rule holds there are times when the erroneous version of the quotient rule holds. Calculate [ƒ(x)g(x)]′ and ƒ′(x)g′(x) for ƒ(x) = ae^k2x/(k-1) and g(x) = be^kx for k ≠ 1, and verify that they are equal.