设全集U=Z,集合M={1,2},则等于( )
若tan(+)="3," tan(-)="5," 则tan2= ( )
函数的周期为( )
的值为( )
设函数f(x)=sin(-2x),xÎR,则f(x)是
要得到函数y=sin2x的图象,只需将y=sin(2x+)的图象