hi there, im currently stuck on 4 questions at the moment

1. 9x^2 -14x + 1 = 0

PROVE THE FOLLOWING IDENTITIES

1. Sin2θSecθ≡SinθTanθ

2. tan2 A= sin2 A / 1 - sin2 A

3. 2 - tan2 A ≡ 2Sec2 A - 3tan2 A

hope someone out there can help would be much appreciated