I am trying to simplify so h does not cause division by zero when h=0. but the algebra is not so obvious to me.

this is what I try.

also

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- July 6th 2011, 02:42 PMskokerdifference quotient
I am trying to simplify so h does not cause division by zero when h=0. but the algebra is not so obvious to me.

this is what I try.

also

- July 6th 2011, 03:21 PMAlso sprach ZarathustraRe: difference quotient
- July 6th 2011, 05:24 PMskokerRe: difference quotient
@Also sprach Zarathustra

I was suspecting rationalization but did not figure out at what step to use it. thanks.

so I get this one.

which gives correct result.