(2010•深圳一模)已知函数f(x)=2cosπ3x x≤2000x−100 &nbs
已知函数f(x)={x^2 x>0 &nbs
(2012•临沂二模)已知函数f(x)=(x2+2ax)e−x,x<0bx, &nbs
(2011•绵阳二模)已知函数f(x)=sin x-cos (x-π6
(2014•湖北二模)已知函数f(x)=cos(2x−2π3)−cos2x(x∈R ).
(2012•崇明县一模)已知函数f(x)=cos(2x+π2 )(x∈R),下面结论错误的是( )
已知函数f(x)=x−1x+2 , x∈[3,5],
(2013•杨浦区一模)(文) 已知函数f(x)=cos(x-π4),
(2012•青岛二模)已知函数f(x)=log2x , x>03−x+1 , x
已知函数f(x)=x+2 x≤0−x+2 x>0
(2011•广东模拟)(本小题满分14分 已知函数f(x)=3sin2x+2sin(π4+x)cos(π4+x
求证:(sin x+cos x−1)(sin x−cos x+1)sin&nbs
已知函数f(x)=2cos2 x+3sin 2x.