Kynian - 9 months ago 35

Java Question

I have a project Im working on where I need to pass an angle as radians to the cos, tan, and sin. Everything seems to work fine except tan of

`90`

`16331239353195370`

`import java.text.DecimalFormat;`

public class mathtable {

public static void main(String[] args) {

System.out.println("Angle Sin Cos Tan");

System.out.println("----- --- --- ---");

for (double angle = 0.0; angle < 180; angle +=5) {

double angle_rad = Math.toRadians(angle);

double sin = Math.sin(angle_rad);

String sin_4 = new DecimalFormat("#.####").format(sin);

double cos = Math.cos(angle_rad);

String cos_4 = new DecimalFormat("#.####").format(cos);

double tan = Math.tan(angle_rad);

String tan_4 = new DecimalFormat("#.####").format(tan);

System.out.println(angle + " " + sin_4 + " " + cos_4 + " " + tan_4);

}

}

}

Answer

Well, `tan(pi/2)`

in radians is essentially infinite, isn't it? So you'd expect to get a very large number, wouldn't you?

See these graphs of sin/cos/tan to see what I mean, remembering that pi/2 radians is 90 degrees.