Evaluate sin 2u, cos 2u, and tan 2u if sec u=3, 3π/2<u<2π.

1)Sin 2u=

1/3

-2√2/3

4√2/9

-4√2/9

2)Cos 2u=

7/9

-7/9

√7/3

-√7/3

3)Tan 2u=

4√2/7

-4√2/7

-√2/4

√2/4