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cos (36^(@) –A) cos (36^(@) +A) +cos (54...

`cos (36^(@) –A) cos (36^(@) +A) +cos (54^(@) –A) cos (54^(@) +A) =cos 2A`

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

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

cos 36^@ - cos72^@ =

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

2 cos 54^(@) * sin 66^(@) =

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

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