refactoring: added specific description

src/trigonometricFunctions.c

@@ -3,7 +3,7 @@
 #include "math.h"
 #include <stdio.h>
 #include <stdlib.h>
-//function for trigonometric
+//function for trigonometric:
 //Function 1 for double
 double* calculate_sin_double(double angle) {
     double* result= malloc(sizeof (double));