Implement trigonometric functions in scientific calculator.

src/main/c/scientificMode.c

@@ -1,8 +1,8 @@
 // scientificMode
 
-#include <stdio.h>
-#include <math.h>
 #include "taschenrechner.h"
+#include <math.h>
+#include <stdio.h>
 
 int scientificMode() {
 
@@ -35,13 +35,35 @@ int scientificMode(){
     break;
 
   case 4: // Trigonometric
-            result = sineFunction(num);
+    printf("Trigonometric functions:\n");
+    printf("5: Sine\n");
+    printf("6: Cosine\n");
+    printf("7: Tangent\n");
+    int trigChoice;
+    scanf("%d", &trigChoice);
+
+    switch (trigChoice) {
+    case 5: // Sine
+      result = sin(num);
+      break;
+
+    case 6: // Cosine
+      result = cos(num);
+      break;
+
+    case 7: // Tangent
+      result = tan(num);
       break;
 
     default:
-            printf("Invalid choice. Please try again.\n");
+      printf("Invalid trigonometric function choice.\n");
       return -1; // Return an error code to indicate failure
+    }
+    break;
 
+  default:
+    printf("Invalid choice. Please try again.\n");
+    return -1; // Return an error code to indicate failure
   }
 
   printf("Result: %lf\n", result);