(1)求函数f(x)=cos[(派x)/3]的值域(2)求值:cos(派/5)加cos(2派/5)加cos(3派/5)加cos(4派/5)有两道数学题,
问题描述:
(1)求函数f(x)=cos[(派x)/3]的值域
(2)求值:cos(派/5)加cos(2派/5)加cos(3派/5)加cos(4派/5)有两道数学题,
答
(1)求函数f(x)=cos[(派x)/3]的值域
(2)求值:cos(派/5)加cos(2派/5)加cos(3派/5)加cos(4派/5)有两道数学题,