(2013•杭州一模)设f(x)=6cos2x-3sin2x(x∈R).
(2013•杭州一模)设f(x)=6cos2x-3sin2x(x∈R).
(2008•杭州二模)设函数f(x)=12x−18sin2x−38cos2x.
(2013•惠州模拟)设函数f(x)=2cos2x+sin2x+a(a∈R).
设函数f(x)=2cos2x+sin2x+a(a∈R).
(2014•成都三模)已知函数f(x)=2cos2x+3sin2x,x∈R.
(2012•江门一模)已知函数f(x)=(1+cos2x)sin2x,x∈R.若f(α)=14
已知函数f(x)=2cos2x+3sin2x+a(a∈R).
(2013•黄梅县模拟)已知函数f(x)=3sin2x-cos2x,x∈R,给出以下说法:
(2012•甘肃一模)(文科)已知函数f(x)=3sin2x+23sinxcosx+cos2x,x∈R.
已知函数f(x)=2+sin2x+cos2x,x∈R.
(2010•杭州一模)已知函数f(x)=2sinxcosx+2cos2x(x∈R).
(2014•达州二模)设函数f(x)=53sinxcosx+6cos2x+sin2x+32.