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" 28.Prove that "(sin^(2)72^(@)*sin^(2)6...

" 28.Prove that "(sin^(2)72^(@)*sin^(2)60^(@))=(sqrt(5)-1)/8

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Provet that: sin^(2)72^(2)-sin^(2)60^(2)=(sqrt(5)-1)/(8)

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Prove that: sin^(2)24^(0)-sin^(2)6^(0)=(sqrt(5)-1)/(8)

Prove that sin ^(2) 72 ^(@)- sin ^(2) 60 ^(@)= (sqrt5-1)/(8).

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Prove that: cos^(2)48^(@)-sin^(2)12^(@)=(sqrt(5)+1)/(8)

Prove that sin^(2)48^(@)-cos^(2)12^(@)=-(sqrt(5)+1)/(8)

Prove that : sin^2(72^@) - sin^2 (60^@) = (sqrt5 - 1)/8