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[" 7."cos(36^(@)-A)*cos(36^(@)+A)+cos(54...

[" 7."cos(36^(@)-A)*cos(36^(@)+A)+cos(54^(@)+A)*cos(54^(@)-A)=],[[(A)cos A," (B) "cos(A)/(2)," (C) "cos2A," (D) "cos3A]]

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

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

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

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

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

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

2 cos 54^(@) * sin 66^(@) =

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

cos^(2) 36^(@) + cos^(2) 72^(@)=