Cos

• Mathematical function (see Section A.3.10).

• The argument of Cos is assumed to be in radians. (Multiply by Degree to convert from degrees.)

• Cos is automatically evaluated when its argument is a simple rational multiple of ; for more complicated rational multiples, FunctionExpand can sometimes be used.

• See Section 1.1.3 and Section 3.2.7.

• See also: ArcCos, Sec, TrigToExp, TrigExpand.

• New in Version 1.