Discussion
Logarithmic differentiation is the natural method for a function of the form
Answer: D
When both the base and the exponent vary, neither the power rule nor the exponential rule applies. Taking logarithms gives \( \ln y = v \ln u \), which differentiates by the product rule, and multiplying back by \( y \) recovers the derivative. Sums, quotients of polynomials and composed trigonometric functions all yield to the ordinary rules
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