Reference > Methods cos(radians)¶ Definition¶ Double cos(Number radians) Description¶ Returns a Double between -1 and 1 that is the trigonometric cosine of an angle. Parameter Definition¶ Name Type Description radians Number Angle in radians Examples¶ 1 2 3Double r1 = cos(0); // r1 == 1.0 Double r2 = cos(10); // r2 == -0.8390715290764524 Double r3 = cos(3); // r3 == -0.9899924966004454