import java.util.Arrays;

public enum CalculateMethod {
	ADD {
		@Override
		public String calculate(String[] args) {
			double a = Double.valueOf(args[0]);
			double b = Double.valueOf(args[1]);
			return String.valueOf(a + b);
		}
	},
	SUBTRACT {
		@Override
		public String calculate(String[] args) {
			double a = Double.valueOf(args[0]);
			double b = Double.valueOf(args[1]);
			return String.valueOf(a - b);
		}
	},
	MULTIPLY {
		@Override
		public String calculate(String[] args) {
			double a = Double.valueOf(args[0]);
			double b = Double.valueOf(args[1]);
			return String.valueOf(a * b);
		}
	},
	DIVIDE {
		@Override
		public String calculate(String[] args) {
			double a = Double.valueOf(args[0]);
			double b = Double.valueOf(args[1]);
			return String.valueOf(a / b);
		}
	},
	MOD {
		@Override
		public String calculate(String[] args) {
			int a = Integer.valueOf(args[0]);
			int b = Integer.valueOf(args[1]);
			return String.valueOf(a % b);
		}
	},
	SIN {
		@Override
		public String calculate(String[] args) {
			Double rad = Double.valueOf(args[0]);
			return String.valueOf(Math.sin(rad));
		}
	},
	COS {
		@Override
		public String calculate(String[] args) {
			Double rad = Double.valueOf(args[0]);
			return String.valueOf(Math.cos(rad));
		}
	},
	TAN {
		@Override
		public String calculate(String[] args) {
			Double rad = Double.valueOf(args[0]);
			return String.valueOf(Math.tan(rad));
		}
	};

	public abstract String calculate(String[] args);

	public static CalculateMethod of(String name) {
		return Arrays.stream(values())
			.filter(method -> method.name().equals(name.toUpperCase()))
			.findFirst()
			.orElse(null);
	}
}

@@ -1020,33 +1020,33 @@
 ng%5B%5D args) %7B%0A%09%09%09
-D
+d
 ouble rad = Doub
@@ -1172,33 +1172,33 @@
 ng%5B%5D args) %7B%0A%09%09%09
-D
+d
 ouble rad = Doub
@@ -1332,17 +1332,17 @@
 s) %7B%0A%09%09%09
-D
+d
 ouble ra
@@ -1362,32 +1362,94 @@
 lueOf(args%5B0%5D);%0A
+%09%09%09double sin = Math.sin(rad);%0A%09%09%09double cos = Math.cos(rad);%0A
 %09%09%09return String
@@ -1461,21 +1461,17 @@
 eOf(
-Math.tan(rad)
+sin / cos
 );%0A%09

change method of getting tan result