Find the required expression without using a calculator :

1. sin2A, give sinA=3/5

2. cos2A, given cosA=3/5

3. tan2A, given tanA=1/2

Now my problem is use the trigo identities to find sin2A. cos2A and tan2A. i know can use triangle to find, but problem is not allow use triangle to find exact value.

THX who Helping!