(2011•日照模拟)关于函数f(x)=sin2x-cos2x有下列命题:
(2011•阜阳模拟)已知函数f(x)=sin2x+cos2x.
(2013•天津模拟)已知函数f(x)=32sin2x−12(cos2x−sin2x)−1
(2010•东城区模拟)函数f(x)=sin2x−3cos2x
(2013•黄梅县模拟)已知函数f(x)=3sin2x-cos2x,x∈R,给出以下说法:
(2013•惠州模拟)设函数f(x)=2cos2x+sin2x+a(a∈R).
(2014•荆州模拟)已知函数f(x)=sin2x+2sin2x1+tanx−23cos2x+3.
(2014•荆州模拟)已知函数f(x)=sin2x+2sin2x1+tanx−23cos2x+3
(2014•云南模拟)已知f(x)=cos2x-sin2x.
(2011•江苏模拟)函数y=3sin2x+cos2x,x∈R
已知函数f(x)=sin2x-cos2x+1
已知函数f(x)=3sin2x+cos2x.
(2013•惠州模拟)已知函数f(x)=2sin2x+2cos2x,x∈R.