Returns a number specifying the cosine of an angle given in radians. It takes a right-angle triangle, and returns the length of the side adjacent to the specified angle divided by the length of the hypotenuse.
Parameter
number - An angle in number of radians.
Return value
Number value between 1 and -1.
Examples
cos(1) - Returns 0.54 (rounded to 2 decimals). This is the cosine of 1 radian.cos(60 * pi / 180) - Returns 0.5. This is the cosine of 60 degrees. Before taking the cosine, the angle is converted to radians by multiplying by pi / 180.