Use trigonometric identities to verify each identity: cot(A/2) - tan(A/2) = 2cotA and

[Millie]

1. cot(A/2) - tan(A/2) = 2cotA

2. sec^2(A/2) = (2(1 - cosA)) / (sin^2(A))

Can anyone help me?

 

[stapel]

1. cot(A/2) - tan(A/2) = 2cotA

2. sec^2(A/2) = (2(1 - cosA)) / (sin^2(A))

Can anyone help me?

You bet!

Please reply with a clear listing of your thoughts and efforts so far on each of the above equations. Once we can see what you've tried and where you're stuck, we'll be able to respond with hints and helps.

Thank you!