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cos36^(@) = . . . . . . . ....

`cos36^(@)` = . . . . . . . .

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

cos 36^@ - cos72^@ =

cos (36 ^ (@) - A) cos (36 ^ (@) + A) + cos (54 ^ (@) + A) cos (54 ^ (@) - A) = cos2A

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

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

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

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

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

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

Prove that : cos 36 ^(@) - sin 18^(@) = (1)/(2).