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Omniscience Group TitleBest ResponseYou've already chosen the best response.0
i integrate it twice; but i dont know why it failed
 2 years ago

irkiz Group TitleBest ResponseYou've already chosen the best response.0
separate them into tanx and dx
 2 years ago

Omniscience Group TitleBest ResponseYou've already chosen the best response.0
i did\[(tanx)(x)  \int\limits xsec^{2}dx \]
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
integral sin x /cos x put t= cos x
 2 years ago

Omniscience Group TitleBest ResponseYou've already chosen the best response.0
i know..but i want to do it by parts
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.0
 ln cos x + C proof int tan x dx = int sinx/cos x set u=cosx then we find du=sinx dx substitute du=sin x, u=cos x int sinx/cos x=  int of (1) sin x dx / cosx = int of du/u Solve the integral =  ln u + C substitute back u=cos x =  ln cos x + C
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.0
ok @Omniscience
 2 years ago

Omniscience Group TitleBest ResponseYou've already chosen the best response.0
i know usub i want to do it by parts
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.0
http://wiki.answers.com/Q/Integration_by_parts_of_x_tanx
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.0
i think it will help you!!!
 2 years ago

Omniscience Group TitleBest ResponseYou've already chosen the best response.0
that's \(xtanx\)
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.0
oh!!! sorry
 2 years ago

irkiz Group TitleBest ResponseYou've already chosen the best response.0
maybe you could try converting tan x to sinx/cosx. then integrate sinxsecx by parts?
 2 years ago

Omniscience Group TitleBest ResponseYou've already chosen the best response.0
ok i will try it
 2 years ago

irkiz Group TitleBest ResponseYou've already chosen the best response.0
wait. is the ans lnsecx?
 2 years ago

Omniscience Group TitleBest ResponseYou've already chosen the best response.0
ln(cosx)
 2 years ago

irkiz Group TitleBest ResponseYou've already chosen the best response.0
looks the same lol
 2 years ago

irkiz Group TitleBest ResponseYou've already chosen the best response.0
sec x is (cosx)^1 bring the 1 to the front
 2 years ago

irkiz Group TitleBest ResponseYou've already chosen the best response.0
yup thats the answer
 2 years ago

Omniscience Group TitleBest ResponseYou've already chosen the best response.0
ok thanks
 2 years ago
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