Fix test precision differences across platforms

Author: kvz

functions/math/acos.js

@@ -1,8 +1,9 @@
 function acos(arg) {
   //  discuss at: http://phpjs.org/functions/acos/
   // original by: Onno Marsman
-  //   example 1: acos(0.3);
-  //   returns 1: 1.2661036727794992
+  //        note: Sorry about the crippled test. Needed because precision differs accross platforms.
+  //   example 1: (acos(0.3) + '').substr(0, 17);
+  //   returns 1: "1.266103672779499"
 
   return Math.acos(arg);
-}
+}

functions/math/asin.js

@@ -1,8 +1,9 @@
 function asin(arg) {
   //  discuss at: http://phpjs.org/functions/asin/
   // original by: Onno Marsman
-  //   example 1: asin(0.3);
-  //   returns 1: 0.3046926540153975
+  //        note: Sorry about the crippled test. Needed because precision differs accross platforms.
+  //   example 1: (asin(0.3) + '').substr(0, 17);
+  //   returns 1: "0.304692654015397"
 
   return Math.asin(arg);
-}
+}