Question

any free trigonometry education software ?

Answer 1

or even a well done electronic
book on the subject :)

Answer 2

www.khanacademy.com
www.patrickjmt.com

Answer 3

thanks :)

Answer 4

You're welcome

Answer 5

not trying to butt in, just add. but here is the study site ive been using for a while that allowed me to stumble on to this site
http://tutorial.math.lamar.edu/cheat_table.aspx

Answer 6

thanks :)