Plotting

1. Trigonometric functions
   1. Plot sin x

   2. Add a plot of cos x to the first plot

   3. Make the plot of sin x blue and the plot of cos x red

2. Polynomials
   1. Plot 3x² + 1 and 2x³ - 4 on the same graph

   2. The graphs intersect at a point just greater than 2. Use the zoom facility to find the intersection point to two decimal places.