f(x)=2√3sinxcosx+2cosx^2+3(1)当x属于(0,π/2)时,求值域(2)若f(x)=28/5,且x属于(π/6,5π/12),求cos(2x-π/12)

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f(x)=2√3sinxcosx+2cosx^2+3(1)当x属于(0,π/2)时,求值域(2)若f(x)=28/5,且x属于(π/6,5π/12),求cos(2x-π/12)f(x)=2√3sinx

f(x)=2√3sinxcosx+2cosx^2+3(1)当x属于(0,π/2)时,求值域(2)若f(x)=28/5,且x属于(π/6,5π/12),求cos(2x-π/12)
f(x)=2√3sinxcosx+2cosx^2+3
(1)当x属于(0,π/2)时,求值域
(2)若f(x)=28/5,且x属于(π/6,5π/12),求cos(2x-π/12)

f(x)=2√3sinxcosx+2cosx^2+3(1)当x属于(0,π/2)时,求值域(2)若f(x)=28/5,且x属于(π/6,5π/12),求cos(2x-π/12)
f(x)=根号3sin2x+2cos^2x+3
=√3sin2x+cos2x+4
=2sin(2x+π/6)+4
0

^是什么意思?^是几次方 π是数学中的3.1415926...............................1. cosX^2=(1+cos2X)/2 sin2X=2sinXcosX f(X)=2√3sinxcosx+2cosx^2+3 =√3sin2X+cos2X+4 =2(√3/2sin2X+1/2cos2X)+4 ...

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