已知f(x)=cos(2x-π6)+cos(2x-5π6)-2cos2x+1,
已知f(x)=cos(2x-π6)+cos(2x-5π6)-2cos2x+1,
已知函数f(x)=3sinxcosx-cos(2x+π3)-cos2x
已知函数f(x)=cos(2x+π/3)+sin2x-cos2x
设函数f(x)=cos(2x-π/3)-cos2x-1
已知f(x)=-1/2+sin(π/6-2x)+cos(2x-π/3)+cos平方x.
已知函数f(x)=(6cos^4x+5sin^2x-4)/cos2x
已知函数f(x)=2cos2x+cos(2x+π2),x∈R
已知函数f(x)=2cos2x+cos(2x+π/3)-1
已知函数f(x)=cos(2x+π/3)+sin2x-cos2x+2√3sinxcosx
已知函数f(x)=(6cos^4x+5sin^2x-4)/cos2x 判断f(x)的奇偶性
(2012•昌平区一模)已知函数f(x)=cos(2x-π3)+sin2x-cos2x.
已知函数f(x)=(4cos^4x-2cos2x-1)/[sin(π/4+x)·sin^2(π/4-x)]化简