已知函数f(x)=3sin(x/2+π/6)用五点画图法画出它在一个周期内的图象

T=2π/0.5=4π
f(x)=3sin[0.5(x+π/3)]
f(x)=0,0.5(x+π/3)=0; 0.5(x+π/3)=π,0.5(x+π/3)=2π;
x=-π/3; x=5π/3; x=11π/3
f(x)=1,0.5(x+π/3)=π/2
x=2π/3;
f(x)=-1,0.5(x+π/3)=3π/2
x=8π/3
五点连接