已知函数f(x)=sin^2x+根号3sinxcosx+2cos^2x当x∈【0,π/4】时求值域_数学解答

已知函数f(x)=sin^2x+根号3sinxcosx+2cos^2x当x∈【0,π/4】时求值域

人气：410 ℃　时间：2019-10-17 01:09:40

解答

答：
f(x)=(sinx)^2+√3sinxcosx+2(cosx)^2
=1+(cosx)^2+(√3/2)*2sinxcosx
=1+(1/2)(cos2x+1)+(√3/2)*sin2x
=(√3/2)sin2x+(1/2)cos2x+3/2
=sin(2x+π/6)+3/2
0