TRIGO HELP!!! NEEDED NOW

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sec^4x - sec^2x = tan^4x + tan^2x

  • TRIGO HELP!!! NEEDED NOW -

    you want a proof?

    sec^4 - sec^2 = sec^2(sec^2 - 1)
    = sec^2 tan^2
    = (tan^2 + 1)(tan^2)
    = tan^4 + tan^2

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