The math expression: <math><msup><mrow><mi>x</mi></mrow><mrow><mi>n</mi></mrow></msup></math> contains several variables so the variable: <m>x</m> is chosen for differentiation
Let's differentiate: <math><mo>(</mo><msup><mrow><mi>x</mi></mrow><mrow><mi>n</mi></mrow></msup><mo>)'</mo></math>

▷<b>Answer: &nbsp; <math><mi>n</mi><mo>·</mo><msup><mrow><mi>x</mi></mrow><mrow><mo>(</mo><mi>n</mi><mo> -</mo><mn>1</mn><mo>)</mo></mrow></msup></math></b><span style='font-size:smaller'> &nbsp; &nbsp; (computation took 2 steps and 2 ms)</span>