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    ApoorvGoel's Avatar
    ApoorvGoel Posts: 36, Reputation: 1
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    #1

    May 2, 2011, 02:16 PM
    Limits
    Q. Lim x->0 (Cos2x-1)/(cosx-1)

    Q. lim x->pi/2 (tan2x)/(x-pi/2)
    Can we solve the above questions with L Hospital rule if yes please solve the above questions with L Hospital rule
    and if no why no.. (answer for both the questions is 4).. Please help me to solve because I am not able to match my answer with this method..
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    May 2, 2011, 02:25 PM

    Yes you can solve these both with l'Hospital's rule.

    Are you able to get 4 for the first question? You have to apply l'Hospital's twice to make it work. As for the second one - it's a little easier because you apply l'Hospital's only once, but the answer is not 4.
    ApoorvGoel's Avatar
    ApoorvGoel Posts: 36, Reputation: 1
    Junior Member
     
    #3

    May 2, 2011, 02:29 PM
    Comment on ebaines's post
    Is the answer for 2nd is 2??
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #4

    May 2, 2011, 02:35 PM
    Quote Originally Posted by ApoorvGoel View Post
    Is the answer for 2nd is 2???
    Yes - very good!

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