Java Math tan() Method

Last Updated : 11 Jul, 2025

The Math.tan() method of java.lang.Math class calculates the trigonometric tangent of an angle. Suppose there is a right-angled triangle, so tan(angle) is the opposite side divided by the adjacent side.

If the argument is NaN or an infinity, then the result returned is NaN.
If the argument is zero, then the result is a zero with the same sign as the argument.

Syntax of Math tan() Method

public static double tan(double angle)

Parameters: The function has one mandatory parameter, "angle" which is in radians.
Returns: The function returns the trigonometric tangent of an angle.

Note: Convert degrees with Math.toRadians(degrees) before passing to tan().

Examples of Java Math tan() Method

Example 1: In this example, we will see the working of Math.tan() method with basic angles.

Java

// Java program to demonstrate working 
// of java.lang.Math.tan() method
import java.lang.Math;

class Geeks {
    public static void main(String args[]) {
        double a = 30;
        double b = Math.toRadians(a);
        System.out.println(Math.tan(b));

        a = 45;
        b = Math.toRadians(a);
        System.out.println(Math.tan(b));

        a = 60;
        b = Math.toRadians(a);
        System.out.println(Math.tan(b));

        a = 0;
        b = Math.toRadians(a);
        System.out.println(Math.tan(b));
    }
}

Output

0.5773502691896257
0.9999999999999999
1.7320508075688767
0.0

Explanation: Here, we convert each angle that are 30 degree, 45 degree, 60 degree, 0 degree, to radians and print the tangent value.

Example 2: In this example, we will see, what happens with NaN and infinity cases.

Java

// Java program to demonstrate working of 
// java.lang.Math.tan() method when argument is NaN or Infinity
import java.lang.Math;

class Geeks {
    public static void main(String args[]) {
        double positiveInfinity = Double.POSITIVE_INFINITY;
        double negativeInfinity = Double.NEGATIVE_INFINITY;
        double nan = Double.NaN;
        double result;

        // argument is negative infinity
        result = Math.tan(negativeInfinity);
        System.out.println(result);

        // argument is positive infinity
        result = Math.tan(positiveInfinity);
        System.out.println(result);

        // argument is NaN
        result = Math.tan(nan);
        System.out.println(result);
    }
}

Output

NaN
NaN
NaN

Explanation: As we discussed earlier, here, NaN or infinite input produces NaN.

Introduction to Java

ChetnaAgarwal

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