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Javascript Math trigonomerial methos return wrong results. Try
alert(Math.sin(Math.PI));
it doesn't return 0.
Maybe problem is with javascript decimal number precision. Is there any workoround to get correct results?
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sin() The Math. sin() function returns the sine of a number in radians.
The Math. cos() method returns the cosine of a number. The Math. cos() method returns a number between -1 and 1.
The cosine is equal to the ratio of the side adjacent to the angle and the hypotenuse of the right-angled triangle they define. The angle must be measured in radians.
The Math. cos() method is used to return the cosine of a number. The Math. cos() method returns a numeric value between -1 and 1, which represents the cosine of the angle given in radians.
It's very, very close to zero, though. (~ 10^-16)
And alert(Math.sin(Math.PI/2)) does return 1.
It's just one of things you have to be careful of when dealing with floating point arithmetic. Rounding errors pop up all over the place.
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