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genius12 Group TitleBest ResponseYou've already chosen the best response.1
You will need to use some identities here:\[\bf \cos(2a)=12\sin^2(a)\]We know what sin(a) is, so we just plug that in to the identity and evaluate.\[\bf \cos(2a)=12(2/9)^2=..?\]Can you evaluate that? @walter9906
 one year ago

walter9906 Group TitleBest ResponseYou've already chosen the best response.0
Thank you. I have one more. find Cos 2A \[\cos A=\sqrt{3}/4\]
 one year ago
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