(2014•云南模拟)已知f(x)=cos2x-sin2x.
(2014•云南模拟)已知f(x)=cos2x-sin2x.
(2011•阜阳模拟)已知函数f(x)=sin2x+cos2x.
(2014•荆州模拟)已知函数f(x)=sin2x+2sin2x1+tanx−23cos2x+3.
(2013•天津模拟)已知函数f(x)=32sin2x−12(cos2x−sin2x)−1
(2014•荆州模拟)已知函数f(x)=sin2x+2sin2x1+tanx−23cos2x+3
已知函数f(x)=3sin2x+cos2x.
(2013•惠州模拟)已知函数f(x)=2sin2x+2cos2x,x∈R.
(2010•舟山模拟)已知函数f(x)=cos(2x−π3)+sin2x−cos2x.
(2013•黄梅县模拟)已知函数f(x)=3sin2x-cos2x,x∈R,给出以下说法:
(2012•南昌模拟)已知函数f(x)=3sin2x+23sinxcosx+5cos2x. &nb
(2013•天津模拟)已知函数f(x)=sin2x+23sinxcosx+3cos2x,x∈R.求:
(2014•武汉模拟)已知函数f(x)=3sin2x+2cos2x+m在区间[0,π2]上的最大值为3,则