> Erlang中文手册 > cos/1 返回一个数字的余弦值

math:cos/1

返回一个数字的余弦值

用法:

cos(X)

返回一个数字的余弦值

Cos = math:cos(90),
io:format("Cos is ~p~n", [Cos]).
Pi = math:pi(),
Cos = math:cos(2 * Pi),
io:format("Cos is ~p~n", [Cos]).