multplying by a form of 1


by Whitishcube
Tags: form, multplying
Whitishcube
Whitishcube is offline
#1
Mar18-10, 12:21 AM
P: 83
1. The problem statement, all variables and given/known data

Integrate 1/(1-secx)dx by multiplying the integrand by a form of 1.


2. Relevant equations

any sort of trig identity?

3. The attempt at a solution

I've tried multiplying by forms of 1 such as secx+tanx, secx-tanx, and others, but when i do, i just end up with a messy looking integrand.
any pointers with this and any other problems like it?
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Mark44
Mark44 is online now
#2
Mar18-10, 12:23 AM
Mentor
P: 21,067
How about multiplying by (1 + sec x)/(1 + sec x)? Is that one you tried?


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