" (ii) "cos36^(@)

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

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

find the value of sin18^(0) and cos36^(@)

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

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

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

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