diff --git a/src/main/c/scientificMode.c b/src/main/c/scientificMode.c
index b855139..32a80c6 100644
--- a/src/main/c/scientificMode.c
+++ b/src/main/c/scientificMode.c
@@ -1,49 +1,71 @@
 // scientificMode
 
-#include <stdio.h>
-#include <math.h>
 #include "taschenrechner.h"
+#include <math.h>
+#include <stdio.h>
 
-int scientificMode(){
+int scientificMode() {
 
-    double num, result;
+  double num, result;
 
-    int choice;
+  int choice;
 
-    printf("Enter a number: ");
-    scanf("%lf", &num); // scan the number from user
+  printf("Enter a number: ");
+  scanf("%lf", &num); // scan the number from user
 
-    printf("Scientific mode Options:\n");
-    printf("1: Square root\n");
-    printf("2: Exponential\n");
-    printf("3: Logarithm\n");
-    printf("4: Trigonometric\n");
-    scanf("%d", &choice); // user choice
+  printf("Scientific mode Options:\n");
+  printf("1: Square root\n");
+  printf("2: Exponential\n");
+  printf("3: Logarithm\n");
+  printf("4: Trigonometric\n");
+  scanf("%d", &choice); // user choice
 
-    switch(choice) {
+  switch (choice) {
 
-        case 1: // Square root
-            result = squareRootFunction(num);
-            break;
+  case 1: // Square root
+    result = squareRootFunction(num);
+    break;
 
-        case 2: // Exponential
-            result = exponentialFunction(num);
-            break;
+  case 2: // Exponential
+    result = exponentialFunction(num);
+    break;
 
-        case 3: // Logarithm
-            result = logarithmFunction(num);
-            break;
+  case 3: // Logarithm
+    result = logarithmFunction(num);
+    break;
 
-        case 4: // Trigonometric
-            result = sineFunction(num);
-            break;
+  case 4: // Trigonometric
+    printf("Trigonometric functions:\n");
+    printf("5: Sine\n");
+    printf("6: Cosine\n");
+    printf("7: Tangent\n");
+    int trigChoice;
+    scanf("%d", &trigChoice);
 
-        default: 
-            printf("Invalid choice. Please try again.\n");
-            return -1; // Return an error code to indicate failure
+    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 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);
-    return result;
+  printf("Result: %lf\n", result);
+  return result;
 }