3.2

Proofs for Parts 1-4 require that you only know and use the basic (fundamental) and pythagorean identities:

Prove Basic Trig Identities Part  1: http://www.youtube.com/watch?v=iKWGv0xcuCA

Prove Basic Trig Identities Part  2: http://www.youtube.com/watch?v=cqqpINKly24

Prove Basic Trig Identities Part  3: http://www.youtube.com/watch?v=h6UGBn6cD4c

Prove Basic Trig Identities Part  4: http://www.youtube.com/watch?v=2m0_HXU2AGg