​(1 - tan^2A)^2 + (1 + tan^2A)^2 = 2sec^2A

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• sec 2A + tan 2A =
• tan^2a-sin^2a
• Solve sec^2A + tan^2A = 5/3
• 3 (tan^2A + sec^2A )=5 (0
• prove tan*2A-tan*2A=tan3AtanA