Write a program that uses matplotlib to draw a plot of sine and cosine from 0 to 2π on the same axes. Include x-axis tick marks every π/2 and y-axis tick marks at -1 and 1. Color the sine wave red and the cosine wave blue. A sample of the resulting line graph is shown below. Your graph should exactly match the sample. Save the resulting figure as sin_cos_pyplot.pdf, and save your Python program as sin_cos_pyplot.py.