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

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

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cos 36^@ - cos72^@ =

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

4 cos 12 ^(@) cos 48^(@) cos 72^(@) = cos 36 ^(@)

cos 55^(@) + cos 65^(@) + cos 175^(@)= A)0B)1C) sin 18^(@) D) cos 36 ^(@)

cos^(2) 36^(@) + cos^(2) 72^(@)=

cos 12 ^(@) cos 24 ^(@) cos 36 ^(@) cos 48^(@) cos 72^(@) cos 84^(@) = (1)/(2 ^(6))

Show that : cos 36^(@) cos 54^(@) - sin 36^(@) sin 54^(@) = 0 .

Prove that sin 36 ^(@) + cos 36 ^(@) = sqrt2 cos 9^(@).

Prove that sin 36^(@) + cos 36^(@) = sqrt(2) cos 9^(@)