(2014•温州二模)已知函数f(x)=cos2x−1sin2x,则有( )
(2014•温州二模)已知函数f(x)=cos2x−1sin2x,则有( )
(2013•怀化二模)已知函数f(x)=32sin2x−12(cos2x−sin2x)−1
(2014•甘肃二模)已知函数f(x)=sin2x+23sinxcosx+3cos2x.
(2014•四川二模)已知函数f(x)=cos2x-sin2x+23sinxcosx.
(2014•四川二模)已知函数f(x)=23sinxcosx-3sin2x-cos2x+3.
已知函数f(x)=sin2x-cos2x+1
(2011•昌平区二模)已知函数f(x)=3sin2x+2cos2x.
(2014•东莞二模)已知函数f(x)=2sin2x+2cos2x,x∈R.
(2013•天津模拟)已知函数f(x)=32sin2x−12(cos2x−sin2x)−1
(2013•潮州二模)已知函数f(x)=3(sin2x−cos2x)−2sinxcosx.
(2009•丰台区二模)已知函数f(x)=2sin2x•cos2x+cos22x-sin22x.,
(2013•河东区二模)已知函数f(x)=(sin2x+cos2x)2-2sin22x.