Y = 3 inches (2x+π/3)

2x+π/3=0, that is, y=0 when x=-π/6.

2x+π/3=π/6, that is, when x=-π/ 12, y=3/2.

2x+π/3=π/4, that is, when x=-π/24, y=(3√2)/2.

2x+π/3=π/3, that is, when x=0, y=(3√3)/2.

2x+π/3=π/2, that is, when x=π/ 12, y=3.

2x+π/3=2π/3, that is, when x=π/6, y=(3√3)/2.

2x+π/3=3π/4, that is, when x=5π/24, y=(3√2)/2.

2x+π/3=5π/6, that is, when x=π/2, y=3/2.

2x+π/3=π, that is, when x=π/3, y=0.

……

Describe the above points with rectangular coordinates and connect them to get the image of the function.

In fact, the five-point method is not necessarily necessary.

Five points is a little short for drawing,