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If cos^4 A/cos^2 B + sin^4 A/sin^2 B =1 then show that cos^4 B/cos^2 A + sin^4 B/sin^2 A =1

If cos^4 A/cos^2 B + sin^4 A/sin^2 B =1 then show that cos^4 B/cos^2 A + sin^4 B/sin^2 A =1

Grade:11

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