已知函数y=Asin(wx+∮)(A,w>0,0

A=1/2
3/4T=(π/12+π/6)所以T=π/3
W=2π/T=2π/(π/3)=6
所以y=1/2sin(6x+∮)
6(-π/6)+∮=0
所以∮=π
y=1/2sin(6x+π)
ymax=1/2
ymin=-1/2