- = (D[x \sup 1 * x \sup (1+m)]) by _.
- = (D[x \sup 1] * x \sup (1+m) + x * D[x \sup (1+m)]) by _.
- = (x \sup (1+m) + x * (costante (1+m) * x \sup m)) by _.
+ = (D[x · x \sup (1+m)]) by _.
+ = (D[x] · x \sup (1+m) + x · D[x \sup (1+m)]) by _.
+ = (x \sup (1+m) + x · (costante (1+m) · x \sup m)) by _.