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" 1."cos(36^(@)-4)cos(36^(@)+4)+cos(54^(...

" 1."cos(36^(@)-4)cos(36^(@)+4)+cos(54^(@)-4)cos(54^(@)+A)=cos24

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

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

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

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

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

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

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

4cos36^(@)+cot7(1)/(2^(@))=

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