diff --git a/src/main/c/Calculator/calculator.c b/src/main/c/Calculator/calculator.c
index 6e75e9b..99894eb 100644
--- a/src/main/c/Calculator/calculator.c
+++ b/src/main/c/Calculator/calculator.c
@@ -227,4 +227,26 @@ double cube(double num) {
 
 double cubeRoot(double num) {
     return cbrt(num);
+}double factorial(double num) {
+    if (num == 0) {
+        return 1;
+    } else {
+        return num * factorial(num - 1);
+    }
+}
+
+double power(double base, double exponent) {
+    return pow(base, exponent);
+}
+
+double sine(double angle) {
+    return sin(angle * M_PI / 180.0);
+}
+
+double cosine(double angle) {
+    return cos(angle * M_PI / 180.0);
+}
+
+double tangent(double angle) {
+    return tan(angle * M_PI / 180.0);
 }