Hello,
You can use the following code to calculate sin(180):
double angle = 180;
double sin180 = Math.sin(Math.toRadians(angle));
System.out.println(Math.round(sin180));

Notice we use Math.round() at the end. Otherwise, you will get a number very close to 0, but not exactly zero.
We hope that was helpful. We’re available for any questions to follow.
Have a great day!