Heres the source code.

```
# Turtle: plot the sine function
import turtle
import math
turtle.speed(0) # Fastest
# Draw X-axis
turtle.penup()
turtle.goto(-220, 0)
turtle.pendown()
turtle.goto(220, 0)
# Draw arrows
turtle.degrees()
turtle.setheading(150)
turtle.forward(20)
turtle.penup()
turtle.goto(220, 0)
turtle.pendown()
turtle.setheading(-150)
turtle.forward(20)
# Draw Y-axis
turtle.penup()
turtle.goto(0, -80)
turtle.pendown()
turtle.goto(0, 80)
turtle.penup()
turtle.goto(0, 80)
turtle.pendown()
turtle.setheading(240)
turtle.forward(20)
turtle.penup()
turtle.goto(0, 80)
turtle.pendown()
turtle.setheading(-60)
turtle.forward(20)
# Draw sine funciton
x = -175
turtle.penup()
turtle.goto(x, 50 * math.sin((x / 100.0) * 2 * math.pi))
turtle.pendown()
for x in range(-175, 176):
turtle.goto(x, 50 * math.sin((x / 100) * 2 * math.pi))
turtle.penup()
turtle.goto(-100, -15)
turtle.pendown()
turtle.write("-2\u03c0")
turtle.penup()
turtle.goto(100, -15)
turtle.pendown()
turtle.write("2\u03c0")
turtle.hideturtle()
turtle.done()
```