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Prove that, cos 67^(@)24' cos7^(@)24' ...

Prove that,
`cos 67^(@)24' cos7^(@)24' + cos82^(@)36' cos22^(@)36' =1/2`

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Prove that cos 36^(@) cos 72^(@) cos 108^(@) cos 144^(@)=1//16 .

Prove that cos 36^(@) cos 72^(@) cos 108^(@) cos 144^(@)=1//16 .

Prove that cos 36^(@) cos 72^(@) cos 108^(@) cos 144^(@)=1//16 .

cos 36^(@) - cos 72^(@) =

cos36^(@)-cos72^(@)=

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