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Lv 5
? asked in Education & ReferenceHomework Help · 7 years ago

How do I simplify 9sec^2(x)-9tan^2(x)?

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  • hayharbr
    Lv 7
    7 years ago
    Favorite Answer

    Factor out 9

    9 ( sec^2 x - tan^2 x) and that's a Pythagorean identity equal to 1 so it's just 9 • 1 = 9

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