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math

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how does

secx(tanx + tan^2x- sec^2x)

simplified to
sec x (tanx -1)?

  • math -

    you should have come across the identity
    sec^2x = tan^2x + 1

    (by dividing each term of sin^2 + cos^2x = 1 by cos^2x )

    sub back in , and you got it

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