java.lang.Math.sin()傳回介于0.0和pi之間的角度的三角正弦。如果參數為NaN或無窮大，則結果為NaN。如果自變量為零，則結果為零，其符号與自變量相同。傳回的值将在-1和1之間。
用法:
public static double sin(double a)
Parameter:
a:the value whose sine is to be returned.
傳回：
此方法傳回參數的正弦值。
範例1：展示java.lang.Math.sin()方法的用法。
// Java program to demonstrate working
// of java.lang.Math.sin() method
import java.lang.Math;
class Gfg {
// driver code
public static void main(String args[])
{
double a = 30;
// converting values to radians
double b = Math.toRadians(a);
System.out.println(Math.sin(b));
a = 45;
// converting values to radians
b = Math.toRadians(a);
System.out.println(Math.sin(b));
a = 60;
// converting values to radians
b = Math.toRadians(a);
System.out.println(Math.sin(b));
a = 90;
// converting values to radians
b = Math.toRadians(a);
System.out.println(Math.sin(b));
}
}
輸出：
0.49999999999999994
0.7071067811865475
0.8660254037844386
1.0
範例2：當參數為NaN或無窮大時，顯示java.lang.Math.sin()方法的用法。
// Java program to demonstrate working
// of java.lang.Math.cos() method infinity case
import java.lang.Math;
public class GFG {
// Driver code
public static void main(String[] args)
{
double positiveInfinity =
Double.POSITIVE_INFINITY;
double negativeInfinity =
Double.NEGATIVE_INFINITY;
double nan = Double.NaN;
double result;
// Here argument is negative infinity,
// output will be NaN
result = Math.sin(negativeInfinity);
System.out.println(result);
// Here argument is positive infinity,
// output will also be NaN
result = Math.sin(positiveInfinity);
System.out.println(result);
// Here argument is NaN, output will be NaN
result = Math.sin(nan);
System.out.println(result);
}
}
輸出：
NaN
NaN
NaN