cos

Format: cos( x )

Arguments: (num) x Angle in radians, may be any real or complex number

Returns: (num) The cosine of angle x

Examples: cos(PI) = -1

cos(60deg) = 0.5

cos(1+I) = 0.834-0.989i

See Also: sin, tan, asin, acos, atan, atan2, PI