fx=asin(wx+φ)(A>0 W>0 |φ|

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fx=asin(wx+φ)(A>0 W>0 |φ|
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fx=asin(wx+φ)(A>0 W>0 |φ|
fx=asin(wx+φ)(A>0 W>0 |φ|

fx=asin(wx+φ)(A>0 W>0 |φ|
(1)解析:由图示:A=2,
∴f(x)=2sin(wx+φ)==>f(0)=2sin(φ)=1==>φ=π/6或φ=5π/6
∵|φ|x=kπ/w-π/(6w)
由图示下一周期起点为x=11π/12
当k=2时,x=2π/w-π/(6w)=11π/12==>12(12π-π)=6*11πw
∴w=12/6=2
∴f(x)=2sin(2x+π/6)
(2)解析:设0