You are talking about Julia's post here:
https://www.jiskha.com/questions/1829582/prove-the-identity-of-the-following-equation-cos-2x-1-cos-x-sin-pi-x-tan-x
Take a look what I did, and note my comments.
I think there is a typo
(cos 2x)/(1/(cos x)) * (sin(pi + x))/(tan x) = (sec(x) - csc(x)) * (csc(x))/(sec^2 x) * (1 - cos^2 x)
My friend and I are having a debate on the true identity of this equation, however my friend learned this subject and I did not. Could someone maybe shed some light on how to find the identity and the steps ?
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