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求解答,给好评,急!
求解答,给好评,急!
求解答,给好评,急!
把2cosX^2转换为1+cos2X
(1) f(x)=a*b=2cos^2x+√3sin2x+m
=cos2x+√3sin2x+m+1
=2sin(2x+π/6)+m+1
2kπ-π/2<=2x+π/6<=2kπ+π/2
kπ-π/3<=x<=kπ+π/6
增区间为【kπ-π/3,kπ+π/6】 k∈Z
在【0,π】内增区间为 【0,π/6】【2π/3,π】
(2)x∈...
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(1) f(x)=a*b=2cos^2x+√3sin2x+m
=cos2x+√3sin2x+m+1
=2sin(2x+π/6)+m+1
2kπ-π/2<=2x+π/6<=2kπ+π/2
kπ-π/3<=x<=kπ+π/6
增区间为【kπ-π/3,kπ+π/6】 k∈Z
在【0,π】内增区间为 【0,π/6】【2π/3,π】
(2)x∈【0,π/6】
2x+π/6∈【π/6,π/2】
所以 2sin(2x+π/6)最大值=2
所以f(x)最大值=3+m
3+m=4
m=1
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