Mathematical function, suitable for both symbolic and numerical manipulation.
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. »
For certain special arguments, Cos automatically evaluates to exact values.
Cos can be evaluated to arbitrary numerical precision.
; for more complicated rational multiples, FunctionExpand can sometimes be used. »
EXAMPLES
Basic Examples 
Scope 