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

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

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

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

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

sin9^(@)+cos9^(@)=sqrt(2)sin54^(@)

Prove that (1)cos36^(@)cos72^(@)cos108^(@)cos144^(@)=(1)/(16)(2) Show that 4sin27^(@)=sqrt(5+sqrt(5))-sqrt(3-sqrt(5))

If 47^(0)+s in61^(0)-s in11^(0)-s in25^(0) is equal to a*sin36^(@) b.cos36^(@) c.cos7^(0) d.cos7^(0)

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

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

Prove that (i) sin 70^(@) cos 10^(@) -cos 70^(@) sin 10^(@) =(sqrt(3))/(2) (ii) cos 50^(@) cos 10^(@) -sin 50^(@) sin 10^(@) =(1)/(2) (ii) cos 80^(@) cos 20^(@) + sin 80^(@) sin 20^(@) =(1)/(2) (iv) sin 36^(@) cos 9^(@) + cos 36^(@) sin 9^(@) =(1)/(sqrt(3))