Common Trig Identities in the HSC (1 Viewer)

[BlueGas]

What are some common trig identities that I should know of for the HSC? I know for example sin/cos = tan, what other common trig identities are there?

 

[rand_althor]

Most of these: http://www.sosmath.com/trig/Trig5/trig5/trig5.html