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# how to differentiate 36/(x^2+9) watch

1. i put this in the derivative calculator and it gave me
-72x/((x^2+9)^2)???
how would you do this and what is the general formula for differentiating reciprocal functions
2. Rewrite as 36(x^2+9)^-1 then differentiate
3. opps sorry i read the question wrong and typed in it wrong i meant integrate 36/(x^2+9)
(Original post by BobbJo)
Rewrite as 36(x^2+9)^-1 then differentiate
4. (Original post by assassinbunny123)
opps sorry i read the question wrong and typed in it wrong i meant integrate 36/(x^2+9)
Use the appropriate substitution concerning tan.

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