Mathematics · Trigonometry

What is (sec2α + tanα · tanβ - tan2α)2 + (tanα - tanβ)2 - sec2α · sec2β equal to?

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What is (sec2α + tanα · tanβ - tan2α)2 + (tanα - tanβ)2 - sec2α · sec2β equal to?

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What is (sec2α + tanα · tanβ - tan2α)2 + (tanα - tanβ)2 - sec2α · sec2β equal to?

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