Question 921758
Feta is a type of cheese. Do you mean *[tex \large \theta] (the Greek letter theta)? Or perhaps the Greek letters beta, eta, or zeta?


Here are graphs of *[tex \large y = \sin \theta] and *[tex \large y = \sin (-\theta)].
http://www.wolframalpha.com/input/?i=y+%3D+sin+theta
http://www.wolframalpha.com/input/?i=y+%3D+sin+-theta


Note that *[tex \large \sin (-\theta) = -\sin \theta] since sine is an odd function.