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Hi All.
I am trying to make my way through the definition for the derivative of
I can follow it fine until this part.
the next part has got me
i am not following how the k is taken out, it just seems to appear? The the k on the numerator is taken out of the fraction to give.
Should I review first principals before continuing?
Thanks
Dave
Can feel it coming together.. Slowly but Surely
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Hi DaveRobinsonUk.
I haven't learnt Latex yet so I'm having to explain this just with text, sorry.
If k is a constant (ie. not a variable like x) then it's ok to multply top and bottom by it, and to extract the top one outside the limit, as it isn't dependant on h.
Then I think there's an error, either in your post or in the text because the e in the limit should be to the power 'kh' not just 'h'.
Treat kh as if it was a single variable tending to zero.
Somewhere earler in the text you should have met that this limit evaluates to 1, which makes the differential k times e to the kx, as required.
Does that help? If not, I'll have to start learning how to do fancy scripts.
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob
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Hi Bob
yes sorry, the missing k is a typo on my part.
Thank you for the help, that has cleared things up for me.
Cheers
Dave
Can feel it coming together.. Slowly but Surely
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You're welcome.
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob
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