refactoring

parsing/src/parsing.rs

@@ -183,6 +183,7 @@ mod tests {
 			("sin(x)cos(x)", true),
 			("x/0", true),
 			("(x+1)(x-3)", true),
+			("cos(xsin(x)x)", true),
 			("(2x+1)x", true),
 			("(2x+1)pi", true),
 			("pi(2x+1)", true),
@@ -223,6 +224,7 @@ mod tests {
 			("pipipipipipi", "π*π*π*π*π*π"),
 			("10pi", "10*π"),
 			("pi10", "π*10"),
+			("10pi10", "10*π*10"),
 			("emax(x)", "e*max(x)"),
 			("pisin(x)", "π*sin(x)"),
 			("e^sin(x)", "e^sin(x)"),