maths.sin answer wrong in Java

Question

I tried the code .The answer should be 0.66913060635885821382627333068678 by calculator.

But I use netbean to run Java code to calculate eh-0.9165215479156338

 time = Math.sin(42.0);

System.out.println(time);

Why?

Tip: if you find yourself writing "X doesn't work in Java" - particularly if it's something so fundamental - you should probably think "I'm using X wrongly" instead. [Look at the Javadoc](https://docs.oracle.com/javase/7/docs/api/java/lang/Math.html#sin(double)), and find out what you're doing wrong. — Andy Turner, Oct 06 '16 at 10:31

score 8 · Accepted Answer · edited Oct 06 '16 at 10:27

8

Because you're calculating the sine of 42 radians.

Try converting to radians first:

time = Math.sin(Math.toRadians(42.0));

edited Oct 06 '16 at 10:27

Andy Turner

answered Oct 06 '16 at 10:26

Kayaman

score 1 · Answer 2 · edited Oct 06 '16 at 10:32

1

As per the java doc of the method.

Parameters:

a - an angle, in radians.

Returns:

the sine of the argument.

The values you see is for sin of 42 radians not for sin of 42 degrees

edited Oct 06 '16 at 10:32

Andy Turner

answered Oct 06 '16 at 10:31

nits.kk

2 Answers2