Posted by **Allessandra** on Saturday, December 17, 2011 at 12:23am.

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 -
**Steve**, Saturday, December 17, 2011 at 5:50am
-sec^2/tan^2 = -sec^2 * cos^2/sin^2 = -1/sin^2 = -csc^2

- Math -
**Steve**, Saturday, December 17, 2011 at 5:51am
also, just as

tan' = sec^2

cot' = -csc^2 as you proved

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