第15题 谢谢
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15.
f(x)=√3sin(x+φ)+cos(x+φ)
=2[(√3/2)sin(x+φ)+(1/2)cos(x+φ)]
=2sin(x+φ+π/6)
f(x)=f(π/3 -x)
将x换成x+π/6
f(π/6+x)=f(π/6-x)
x=π/6是f(x)的一条对称轴。
φ+π/6=π/3
f(x)=2sin(x+π/3)
x∈[0,2π],则π/3≤x+π/3≤7π/3
π/3≤x+π/3≤π/2或3π/2≤x+π/3≤7π/3时,f(x)单调递增
此时0≤x≤π/6或7π/6≤x≤2π
函数f(x)的单调递增区间为[0,π/6]、[7π/6,2π]
f(x)=√3sin(x+φ)+cos(x+φ)
=2[(√3/2)sin(x+φ)+(1/2)cos(x+φ)]
=2sin(x+φ+π/6)
f(x)=f(π/3 -x)
将x换成x+π/6
f(π/6+x)=f(π/6-x)
x=π/6是f(x)的一条对称轴。
φ+π/6=π/3
f(x)=2sin(x+π/3)
x∈[0,2π],则π/3≤x+π/3≤7π/3
π/3≤x+π/3≤π/2或3π/2≤x+π/3≤7π/3时,f(x)单调递增
此时0≤x≤π/6或7π/6≤x≤2π
函数f(x)的单调递增区间为[0,π/6]、[7π/6,2π]
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