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duff44
Group Title
find the integral of 1/x sqrt(5x^2)
not sure how to do an identity with the 5 in there
 one year ago
 one year ago
duff44 Group Title
find the integral of 1/x sqrt(5x^2) not sure how to do an identity with the 5 in there
 one year ago
 one year ago

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tkhunny Group TitleBest ResponseYou've already chosen the best response.1
What would you do if it were a '1', rather than a '5'?
 one year ago

Goten77 Group TitleBest ResponseYou've already chosen the best response.0
dw:1359690189282:dw hmm let me think for a sec
 one year ago

duff44 Group TitleBest ResponseYou've already chosen the best response.0
well if it was a 1 I could use a^2x^2 as the identity for sin but I dont think taking sqrt of 5 is the way to go.
 one year ago

tkhunny Group TitleBest ResponseYou've already chosen the best response.1
You didn't quite answer my question. What substitution would you actually use if it were a 1?
 one year ago

matricked Group TitleBest ResponseYou've already chosen the best response.0
assume x=sqrt(5)*sinp ...
 one year ago

duff44 Group TitleBest ResponseYou've already chosen the best response.0
I would make x=sin theta sodw:1359690857236:dw
 one year ago

tkhunny Group TitleBest ResponseYou've already chosen the best response.1
Perfect. So, \(1  x^{2}\) leads to \(x = \sin(\theta)\). You already suggested that \(a^{2}  x^{2}\) leads to \(x = a\cdot\sin{\theta}\). Why would \(5  x^{2}\) lead to anything but \(x = \sqrt{5}\cdot\sin(\theta)\)?
 one year ago

duff44 Group TitleBest ResponseYou've already chosen the best response.0
dw:1359691617818:dw then just plug back in x for theta?
 one year ago
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