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[y=20,y=20+15*sin(3*t),(t-π/6)*(t-π/2)=0]t=0to2*π/3,y=4to36
[y=20,y=20+15*sin(3*t),(t-π/6)*(t-π/2)=0]t=0to2*π/3,y=4to36
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