cos36=?

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

cos 36^@ - cos72^@ =

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

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

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

Show that cos 36^(@) cos 54 ^(@) -sin 36^(@) sin 54^(@) =0

Show that cos 36^(@) cos 54 ^(@) -sin 36^(@) sin 54^(@) =0

Show that cos 36^(@) cos 54 ^(@) -sin 36^(@) sin 54^(@) =0

Show that cos 36^(@) cos 54 ^(@) -sin 36^(@) sin 54^(@) =0

Show that : cos 36^(@) cos 54^(@) - sin 36^(@) sin 54^(@) = 0 .