Answer
code
Work Step by Step
# 6.43 (Turtle: plot the sine and cosine functions) Simplify the code for Exercise 5.53 by
# using the functions in Listing 6.14.
import math
import turtle
# Draw a line from (x1, y1) to (x2, y2)
def drawLine(x1, y1, x2, y2):
turtle.penup()
turtle.goto(x1, y1)
turtle.pendown()
turtle.goto(x2, y2)
# Write a text at the specified location (x, y)
def writeText(s, x, y):
turtle.penup() # Pull the pen up
turtle.goto(x, y)
turtle.pendown() # Pull the pen down
turtle.write(s) # Write a string
turtle.speed(0) # Fastest
# Draw X-axis
drawLine(-220, 0, 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
drawLine(0, -80, 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 function
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 / 100.0) * 2 * math.pi))
turtle.penup()
turtle.goto(x, 50 * math.cos((x / 100.0) * 2 * math.pi))
turtle.pendown()
for x in range(-175, 176):
turtle.goto(x, 50 * math.cos((x / 100.0) * 2 * math.pi))
writeText("-2\u03c0", -100, -15)
writeText("2\u03c0", 100, -15 )
turtle.hideturtle()
turtle.done()
