已知:函数f(x)=2根号3sinxcosx—cos^2 x+sin^2 x (1)求函数f(x)的最小正周期,(2)当x属于[0,π/2]时,求f(x)的值域
问题描述:
已知:函数f(x)=2根号3sinxcosx—cos^2 x+sin^2 x (1)求函数f(x)的最小正周期,(2)当x属于[0,π/2]时,求f(x)的值域
答
f(x)=2根号3sinxcosx—cos^2 x+sin^2 x=根号3sin2x-cos2 x=2sin(2x-π/6)则函数f(x)的最小正周期=T=2π/2=π0≤x≤π/2时-1/6π≤2x-π/6≤5π/6则 当2x-π/6 =-1/6π时,f(x)取最小值为-12x-π/6=π/2时,f(x)取最,...