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# Core 4 trig identity Watch

1. Prove:
tanxsec(0.5x) = 2sin(0.5x)secx

Could someone please tell me how to work this one out?
2. (Original post by Smcdonald98)
Prove:
tanxsec(0.5x) = 2sin(0.5x)secx

Could someone please tell me how to work this one out?
Starting with the LHS, note that . Can you express in terms of and ? Hint: Double angle formulae.
3. (Original post by Smcdonald98)
Prove:
tanxsec(0.5x) = 2sin(0.5x)secx

Could someone please tell me how to work this one out?
which paper is this from?
4. easiest thing ever is c4
5. (Original post by Farhan.Hanif93)
Starting with the LHS, note that . Can you express in terms of and ? Hint: Double angle formulae.
Got it now, thanks!
6. (Original post by EconEast)
which paper is this from?
It's from the CCEA textbook

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