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Trigonometry help (1 Viewer)

cookiez69

What a stupid name, Nat.
Joined
Sep 16, 2012
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HSC
2014
a) Prove that provided that

b) Hence find the exact value of

ANSWER:

I've already answered the first question, I just need help with the second one... Please and thank you :]
 

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cookiez69

What a stupid name, Nat.
Joined
Sep 16, 2012
Messages
74
Gender
Male
HSC
2014
Thanks, so far I've gotten , which when plugged into the calculator is also sqrt(2)-1, I just need help simplifying that please.
 

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