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Henry.Lister Group TitleBest ResponseYou've already chosen the best response.0
\[\cos 22.5 = \frac{ 1 }{ 2 }\sqrt{2+\sqrt{2}}\]
 2 years ago

mukushla Group TitleBest ResponseYou've already chosen the best response.1
22.5=45/2 ... so i'd probably say use half angle formula for cos :\[\cos^2\theta=\frac{1+\cos 2 \theta }{2}\]
 2 years ago

Henry.Lister Group TitleBest ResponseYou've already chosen the best response.0
Walk me through the steps?
 2 years ago

Zekarias Group TitleBest ResponseYou've already chosen the best response.1
\[\cos(45)=\cos(22.5+22.5)=\cos^{2}(22.5)\sin^{2}(22.5)......but...\sin^{2}(22.5)=1\cos^{2}(22.5)\]\[\cos(45)=2\cos^{2}(22.5)1\]\[\frac{ \cos(45)+1 }{ 2 }=\cos^{2}(22.5)\]\[\cos(22.5)=\sqrt{\frac{ \cos(45) +1}{ 2}}\]then you do it
 2 years ago
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