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" 16.Prove that "(sin^(2)3A)/(sin^(2)A)-...

" 16.Prove that "(sin^(2)3A)/(sin^(2)A)-(cos^(2)3A)/(cos^(2)A)=8cos2A

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(sin^(2)3A)/(sin^2A)-(cos^(2)3A)/(cos^2A)=

(sin^2 3A)/(sin^2A)-(cos^2 3A)/(cos^2A)=

(sin^2 3A)/(sin^2A)-(cos^2 3A)/(cos^2A)=

(sin ^2 3A )/( sin ^2 A ) -( cos^2 3A )/(cos ^2 A ) is

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