f(17π/6-5x3π/6)=f(π/3)=1
f(1)=a+bsin1+1=5,ax^3+bsin1=4,f(-1)=-a-bsin1+1-3
f(-x)=-f(x),f(5)=f(-1)=-f(1)=1
f(2)f(0)=-1,f(0)f(-2)=-1,-1/f(0)=f(2)=f(-2),T=4
f(17π/6-5x3π/6)=f(π/3)=1
f(1)=a+bsin1+1=5,ax^3+bsin1=4,f(-1)=-a-bsin1+1-3
f(-x)=-f(x),f(5)=f(-1)=-f(1)=1
f(2)f(0)=-1,f(0)f(-2)=-1,-1/f(0)=f(2)=f(-2),T=4