1. $ x\! $ oscillates between $ -0.5\! $ and $ 0.5\! $.
Dos (2 in Spanish). $ x(t)\! $ is even and real.
San (3 in Chinese). It is periodic with a period of 2.
Here is the answer to the game like Allen I:
$ x(t) = 0.5sin(\pi[t])\! $
