(ix)sin54^(@)-cos36^(@)

Evalute (f) (sin36^(@))/(cos54^(@))-(sin54^(@))/(cos36^(@))

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

Prove that (sin36^(@))/(cos54^(@))+(cos36^(@))/(sin54^(@))=2

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

Value of (2sin9^(@)sin 21^(@)sin 39^(@)sin 51^(@)cos21^(@)sin 81^(@))/(sin54^(@)) is equal to:-

Value of (2sin9^(@)sin 21^(@)sin 39^(@)sin 51^(@)cos21^(@)sin 81^(@))/(sin54^(@)) is equal to:-

Evaluate the following: (i) (cos37^(@))/(sin53^(@))(ii)(sin41^(@))/(cos49^(@))(iii)(tan54^(@))/(cot36^(@))

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

(cos9^(@)+sin9^(@))/(cos9^(@)-sin9^(@))=tan54^(@)