| − | A power rule is any mathematical rule or shortcut that applies when there is a variable to a constant power. The most common example is the power rule of differentiation, <math>f'(x^n) = n(x^(n-1)) </math> | + | A power rule is any mathematical rule or shortcut that applies when there is a variable to a constant power. The most common example is the power rule of differentiation, <br> |