Let's solve the following physics problem using Symbolism, a computer algebra library for C#.
One strategy in a snowball fight is to throw a first snowball at a high angle over level ground. While your opponent is watching the first one, you throw a second one at a low angle and timed to arrive at your opponent before or at the same time as the first one.
Assume both snowballs are thrown with a speed of 25.0 m/s.
The first one is thrown at an angle of 70.0° with respect to the horizontal.