Thread: Controlling derivation

Which one is right ?
My answer or answer form book.

Is there possibility to control by computer wheter answer at x after taking derivation is right or wrong ?
For example:
According to my derivation and taking x as 5 gives y^5=0.0013...
According to derivation form mathbook and taking x as 5 gives y^5=0.0010...
The bigger numbers the bigger differences.

My answer seems to be fine.
http://wims.unice.fr/wims/wims.cgi?s...on=12&format=t gives the same as I have.