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- January 20th 2013, 12:02 PM #1
## tan(A/2) + cot(A/2) = 2cosecA

Hello

Could someone please help me start with proving the following identity:

I'm trying to show that the L.H.S = the R.H.S. I've tried finding the half angle formula for , but it looks like a quadratic. I have also tried writing the L.H.S as a single term. I'm totally stuck. A hint would be greatly appreciated.

Thank you

- January 20th 2013, 12:18 PM #2

- January 20th 2013, 12:28 PM #3

- January 20th 2013, 12:45 PM #4