传说中的测试题
幼苗
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f(x)=(sinwx+coswx)^2+2(coswx)^2
=1+2sinwxcoswx+2(coswx)^2
=sin2wx+cos2wx+2
=√2sin(2wx+π/4)+2
1,最小正周期T=2π/2w=2π/3,则w=3/2.
2,f(x)=√2sin(3x+π/4)+2向右平移π/2个单位.
则g(x)=√2sin[3(x-π/2)+π/4]+2=√2sin(3x-5π/4)+2=√2sin(3x-π/4)+2.
2kπ-π/2
1年前
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