feat(types): remove some redundant parenthesis

src/math/display.rs

@@ -22,10 +22,10 @@ impl Display for Expression {
             Expression::Number(num) => write!(f, "{}", num),
             Expression::Variable(var) => write!(f, "{}", var),
             Expression::Fraction(numerator, denominator) => {
-                write!(f, "({}) / ({})", numerator, denominator)
+                write!(f, "({} / {})", numerator, denominator)
             }
             Expression::Operation(operator, left, right) => {
-                write!(f, "({}) {} ({})", left, operator, right)
+                write!(f, "({} {} {})", left, operator, right)
             }
             Expression::Function(name, params) => {
                 let params: String = params