# Getting the acos, asin or atan or a number

The asin is the inverse sin: sin(a) = b, asin(b) = a
The acos is the inverse cos: cos(a) = b, acos(b) = a
The atan is the inverse tan: tan(a) = b, atan(b) = a

To use asin, acos and atan in your Java programs, use the static methods in the Math class.
Here’s an example:

```import java.math.*;

public class Main
{
public static void main(String args[]) throws Exception {
double asinAngle = Math.asin(0.6287930240184686);
double acosAngle = Math.acos(0.7775727187509279);
double atanAngle = Math.atan(0.8086613751425653);

System.out.println("asin: " + asinAngle);
System.out.println("acos: " + acosAngle);
System.out.println("atan: " + atanAngle);
}
}
```

outputs:

```asin: 0.6800000000000002
acos: 0.68
atan: 0.68
```

Note: angles to the trigonometric math methods should be given in radians.
If you want to use degrees, you have to convert the radians first:

```     360 degrees = 2 pi radians

So, to convert radians into degrees, multiply by 180 / Math.PI
to convert degrees into radians, multiply by Math.PI / 180
```