Derivative Criterion for Constant Product

Rarely Tested

Derivative Criterion for Constant Product

For non-zero differentiable functions:

$$\frac{f'(x)}{f(x)}+\frac{g'(x)}{g(x)}=0$$

implies:

$$f(x)g(x)=C$$

Usage

- Used to recognize when the product of two functions remains constant.

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