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double tan(double d)

public class Test{
    public static void main(String args[]){

        double degrees = 45.0;
        double radians = Math.toRadians(degrees);

        System.out.format("The value of pi is %.4f%n", Math.PI);
        System.out.format("The tangent of %.1f degrees is %.4f%n", degrees, Math.tan(radians));

    }
}

The value of pi is 3.1416
The tangent of 45.0 degrees is 1.0000