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Differentiate 1/tanx

I got -sec^2 / tan^2x, which is correct, but the answers said I could also simplify this to -cosec^2. How would you do that?

Thanks =)

  • Math -

    -sec^2/tan^2 = -sec^2 * cos^2/sin^2 = -1/sin^2 = -csc^2

  • Math -

    also, just as
    tan' = sec^2
    cot' = -csc^2 as you proved

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