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2014-02-06 · 知道合伙人教育行家
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(1)f(x)=√3sin2x-2sin^2x=√3sin2x-(1-cos2x)
= √3sin2x+cos2x-1=2sin(2x+π/6)-1
最大值=2-1=1
(2) 2sin(2x+π/6)-1=0, sin(2x+π/6)=1/2,
2x+π/6=2kπ+π/6或 2kπ+5π/6
2x=2kπ或2kπ+2π/3
x=kπ或kπ+π/3 (k∈Z)
集合={x| x=kπ或kπ+π/3, (k∈Z)}
= √3sin2x+cos2x-1=2sin(2x+π/6)-1
最大值=2-1=1
(2) 2sin(2x+π/6)-1=0, sin(2x+π/6)=1/2,
2x+π/6=2kπ+π/6或 2kπ+5π/6
2x=2kπ或2kπ+2π/3
x=kπ或kπ+π/3 (k∈Z)
集合={x| x=kπ或kπ+π/3, (k∈Z)}
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