1. Sep 29, 2012 #1

   Angeline Ling

   

   1. The problem statement, all variables and given/known data
   lim [(5^(n+1))+(7^(n+1))]/(5^n-7^n) as x→infinity
   lim [sec x - tan x] as x → ∏/2

    

   Angeline Ling, Sep 29, 2012
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3. Sep 29, 2012 #2

   HallsofIvy

   

   Science Advisor

   Sigh. So you did not read the introductory material nor look at very many posts here. If you had, you would have realized: "This is perhaps the most common mistake that new members make. When posting homework, if you do not make any attempt yourself, then other people are not allowed to help at all!! This holds particularly true in the homework forums!"

    

   HallsofIvy, Sep 29, 2012

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