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

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

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cos 36^@ - cos72^@ =

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

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

Prove that (sin36^(@)+cos36^(@))/(cos54^(@)+sin54^(@))=1

sin36^(@)+cos36^(@)=sqrt(2)cos9^(@)

cos54^(@)cos36^(@)-sin54^(@)sin36^(@)=0

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

The value of cos12^(@)cos24^(@)cos36^(@)cos48^(@)cos72^(@)cos84^(@), is

The value of cos12^(@)cos24^(@)cos36^(@)cos48^(@)cos72^(@)cos84^(@), is