|Nov5-07, 08:32 AM||#1|
question on substitution
1. The problem statement, all variables and given/known data
prove by substitution that definite integral int (1/t)dt from [x to x*y] = int (1/t)dt from [1 to y].
2. Relevant equations
3. The attempt at a solution
i can do this problem if i integrate and use the log laws, no probs, but the question says to use a substitution, ive tried many but to no avail, a push in the right direction would be greatly appreciated. Ive asked yesterday about a similar question, which thanks to the forums help i understand. this is the last one on the section and then ill be confident that i can put it rest.
|Nov5-07, 08:41 AM||#2|
Try the obvious, u=t/x.
|Nov5-07, 12:07 PM||#3|
thks very much, ive learnt more of these two questions, than the previous easier 30.
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