derive x^3-4*x
Let's perform the differentiation: <math><mo>(</mo><msup><mrow><mi>x</mi></mrow><mrow><mn>3</mn></mrow></msup><mo> -</mo><mn>4</mn><mi>x</mi><mo>)'</mo></math> <math><mo>(</mo><msup><mrow><mi>x</mi></mrow><mrow><mn>3</mn></mrow></msup><mo>)'</mo><mo> + </mo><mo>(</mo><mo>-</mo><mn>4</mn><mi>x</mi><mo>)'</mo></math> ▷<b>Result: <math><mn>3</mn><msup><mrow><mi>x</mi></mrow><mrow><mn>2</mn></mrow></msup><mo> -</mo><mn>4</mn></math></b><span style='font-size:smaller'> (processing: 2 steps, 1 ms)</span>
