Simplify in terms of the indicated angle:

1-2sin^2 3A; in terms of 6A

2)

Simplify:

cosA(cos4A+2sin^2 2A)

3)

Prove:

(cos@+sin@)/(cos@-sin@) = sec2@+tan2@

4)

Write down expressions for tan3@ and cos3@ in terms of the angle @. (argh what kind of question i sthis??? :S)

5)

Evaluate the integral from pi/4 to 0 of (cos^2 @ -1)

6)

Write down a formula for sin3@ in terms of the angle @

thanks... any help is muchly appreciated