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cos^(3) 20^(@) + cos^(3) 100^(@) + cos^(...

`cos^(3) 20^(@) + cos^(3) 100^(@) + cos^(3) 140^(@) = `

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cos ^(3) 110 ^(@) + cos ^(3) 10^(@) + cos ^(3) 130^(@)=

cos ^(3) 110 ^(@) + cos ^(3) 10^(@) + cos ^(3) 130^(@)=

4(cos^3 20^(@) + cos^(3) 40^(@))=

4( cos^(3) 10^(@) + sin^(3) 20^(@))=

4 (cos ^(3) 20^(@) + cos ^(3) 40^(@)) = 3 ( cos 20 ^(@) + cos 40^(@))

cos 20^(@) + cos 100^(@) + cos 140^(@) = 0

cos 20^(@) + cos 100^(@) + cos 140^(@) =

8 cos^(3) 20^(@) -6 cos 20^(@) =

Prove that 4(cos ^(3) 10^(@) + sin ^(3) 20^(@)) = 3 ( cos 10^(@) + sin 20^(@)).

cos^(3)110^(@)+cos^(3)10^(@)+cos^(3)130^(@)=