Feat(compute): Multiply strpower and str done

Discover bug with str and * printing

mapytex/calculus/API/__init__.py

@@ -41,7 +41,16 @@ Generate and compute like a student!
 (2 / 3)^4
 2^4 / 3^4
 16 / 81
-
+>>> e = Expression.from_str("x^2*x*x^4")
+>>> e_simplified = e.simplify()
+>>> print(e_simplified)
+x^7
+>>> for s in e_simplified.explain():
+...    print(s)
+x^2 * x * x^4
+x^3 * x^4
+x^(3 + 4)
+x^7
 """
 
 from .expression import Expression