Question

Can someone tell me the Complementary Angles (cos,sin ect) properties/forms or where to find them? (eg. sin(10)= cos(90-80) ) Thats what I mean

Answer 1

Forms like (eg. sin(10)= cos(90-80) ) ? where can I find them?

Answer 2

http://www.mathwords.com/t/trig_identities.htm

The ones you're looking for are probably under "confuction identities
, degrees"

Answer 3

so maybe http://en.wikipedia.org/wiki/Complementary_angles

Answer 4

however
\[\sin(10°) = \cos((90-80)°)\]
False