高一数学,求大神解答!
2014-01-02
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a·b=-(coswx-sinwx)(coswx+sinwx)+√3sin(2wx)
=√3sin(2wx)-cos(2wx)
=2sin(2wx-π/6)
故:f(x)=2sin(2wx-π/6)+λ
由于T=π,即:T=2Pai/(2w)=Pai,那么有w=1
1
故:f(x)=2sin(x-π/6)+λ
对称轴是x-Pai/6=kPai+Pai/2,即有x=kPai+2Pai/3
2
函数点(π/4,0),即:2sin(π/4-π/6)+λ
=2sin(π/12)+λ=(√6-根号2)/2+λ=0
即:λ=(√2-根号6)/2
即:f(x)=2sin(x-π/6)-√2
x∈[0,5π/12],故:x-π/6∈[-π/6,π/4]
故:sin(x-π/6)∈[-1/2,根号2/2]
故:2sin(x-π/6)+(√2-根号6)/2∈[-1+(√2-根号6)/2,(3√2-根号6)/2]
=√3sin(2wx)-cos(2wx)
=2sin(2wx-π/6)
故:f(x)=2sin(2wx-π/6)+λ
由于T=π,即:T=2Pai/(2w)=Pai,那么有w=1
1
故:f(x)=2sin(x-π/6)+λ
对称轴是x-Pai/6=kPai+Pai/2,即有x=kPai+2Pai/3
2
函数点(π/4,0),即:2sin(π/4-π/6)+λ
=2sin(π/12)+λ=(√6-根号2)/2+λ=0
即:λ=(√2-根号6)/2
即:f(x)=2sin(x-π/6)-√2
x∈[0,5π/12],故:x-π/6∈[-π/6,π/4]
故:sin(x-π/6)∈[-1/2,根号2/2]
故:2sin(x-π/6)+(√2-根号6)/2∈[-1+(√2-根号6)/2,(3√2-根号6)/2]
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