Original post by mqb2766
Are you allowed to use the double angle identity (twice) to get cos(theta), then cos(2theta)?
You could do it geometrically, but cant help thinking youd simply be rederiving the identity (not worked it through).
You could do it geometrically, but cant help thinking youd simply be rederiving the identity (not worked it through).
I just tried it and it does work. Ty for the help
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