Fix #610

Calculus.js

@@ -489,7 +489,7 @@ if((typeof module) !== 'undefined' && typeof nerdamer === 'undefined') {
 
                 return symbol;
             }
-            ;
+
             function derive(symbol) {
                 var g = symbol.group, a, b, cp;
 
@@ -696,7 +696,8 @@ if((typeof module) !== 'undefined' && typeof nerdamer === 'undefined') {
                     symbol = _.multiply(polydiff(symbol.clone()), derive(b));
                 }
                 else if(g === CP || g === PL) {
-                    var c = _.parse(symbol);
+                    // Note: Do not use `parse` since this puts back the sqrt and causes a bug as in #610. Use clone.
+                    var c = symbol.clone();
                     var result = new Symbol(0);
                     for(var x in symbol.symbols) {
                         result = _.add(result, __.diff(symbol.symbols[x].clone(), d));
@@ -2667,4 +2668,4 @@ if((typeof module) !== 'undefined' && typeof nerdamer === 'undefined') {
     //link registered functions externally
     nerdamer.api();
 
-})();
+})();

nerdamer.core.js

@@ -7654,6 +7654,11 @@ var nerdamer = (function (imports) {
             if(!isSymbol(symbol)) {
                 symbol = _.parse(symbol);
             }
+
+            // Exit early for EX
+            if(symbol.group === EX) {
+                return _.symfunction(SQRT, [symbol]);
+            }
 
             if(symbol.fname === '' && symbol.power.equals(1))
                 symbol = symbol.args[0];
@@ -12543,4 +12548,9 @@ var nerdamer = (function (imports) {
 
 if((typeof module) !== 'undefined') {
     module.exports = nerdamer;
-};
+};
+
+
+
+var ans = nerdamer('sqrt(3^x)');
+console.log(ans.toString())