(2011•嘉定区三模)函数f(x)=cos(x+π4)cos(x−π4)
(2011•嘉定区三模)函数f(x)=cos(x+π4)cos(x−π4)
(2013•宁波二模)函数f(x)=cos(x+π4)−cos(x−π4)是( )
(2013•莱芜二模)已知函数f(x)=22cos(x+π4)cos(x−π4)+22sinxcosx.
(2011•朝阳区三模)设函数f(x)=cos(2x+π6)+sin2x.
(2010•河南三模)已知函数f(x)=sin(3π4−x)−3cos(x+π4),x∈R,则f(x)是( )
(2011•渭南三模)设函数f(x)=cos(2x−π3)−cos2x,x∈R.
(2012•朝阳区一模)已知函数f(x)=cos(x−π4).
(2009•崇明县二模)函数y=2cos(x+π4)cos(π4−x)
已知函数f(x)=sin(π2+x)cos(−x)+4sinx2cos3x2−sinx,
(2010•长春三模)已知函数f(x)=sin(x+π2),g(x)=cos(x−π2),设h(x)=f(x)g(x),
(2011•惠州模拟)函数f(x)=2sin(π4−x)cos(π4+x)−1,x∈R是( )
若函数f(x)=2cos(π4