If I want to find the , using L'Hopital's rule, also knowing is equal to 1, how many times should I differentiate? i differentiated it once, and my answer was that the limit = -1 Is this correct? Thanks in advance.
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I do not find the same result as you, apart from the fact that I needed only to differentiate once !
differentiate once: so eliminate (which you didnīt) and you have that the limit is 0
Originally Posted by Inti differentiate once: so eliminate (which you didnīt) and you have that the limit is 0 Hey, thanks for the quick reply. I can't see how is the derivative of [tex]\frac{cosx-xsinx-cosx}{2x}[/math. Could you please explain? Thanks again.
I just cancelled the opposite cosines, I wasnīt differentiating...
Originally Posted by Inti I just cancelled the opposite cosines, I wasnīt differentiating... Sorry Inti, but I still can't see what you're doing... Initially we had: Then you differentiate it, right? or what did you do to get the following? I can see how you can cancel after differentiating... See, the problem is now that my derivative of is
Originally Posted by tsal15 Sorry Inti, but I still can't see what you're doing... Initially we had: Then you differentiate it, right? or what did you do to get the following? I can see how you can cancel after differentiating... See, the problem is now that my derivative of is OK tsal15 just a minute Differentiate is (sign mistake I think) Anyway it does not matter because this is not what L'Hopital's rule says It says You do not need to differentiate Therefore is
**** yeah!!! I was going to ask exactly that: if he/she was differentiating THE ENTIRE FUNCTION instead of the dividend and the divisor separately...
Originally Posted by Inti **** yeah!!! I was going to ask exactly that: if he/she was differentiating THE ENTIRE FUNCTION instead of the dividend and the divisor separately... I get you now...So, the limit is equal to ZERO? thanks for your help, Inti
Originally Posted by running-gag OK tsal15 just a minute Differentiate is (sign mistake I think) Anyway it does not matter because this is not what L'Hopital's rule says It says You do not need to differentiate Therefore is OF COURSE!!! DOH!!! thanks, running-gag. so, the limit is equal to 0 (zero)? thanks for your help.
Originally Posted by tsal15 I get you now...So, the limit is equal to ZERO? Yes the limit is equal to 0
Originally Posted by running-gag Yes the limit is equal to 0 GREAT thanks
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