若函数Y=SIN(3X-π/4)=a(0

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若函数Y=SIN(3X-π/4)=a(0

若函数Y=SIN(3X-π/4)=a(0
若函数Y=SIN(3X-π/4)=a(0

若函数Y=SIN(3X-π/4)=a(0
sin(3X-π/4)=a(0