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OmniscienceBest ResponseYou've already chosen the best response.0
i integrate it twice; but i dont know why it failed
 one year ago

irkizBest ResponseYou've already chosen the best response.0
separate them into tanx and dx
 one year ago

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

hartnnBest ResponseYou've already chosen the best response.0
integral sin x /cos x put t= cos x
 one year ago

OmniscienceBest ResponseYou've already chosen the best response.0
i know..but i want to do it by parts
 one year ago

mayankdevnaniBest 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
 one year ago

OmniscienceBest ResponseYou've already chosen the best response.0
i know usub i want to do it by parts
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.0
http://wiki.answers.com/Q/Integration_by_parts_of_x_tanx
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.0
i think it will help you!!!
 one year ago

irkizBest ResponseYou've already chosen the best response.0
maybe you could try converting tan x to sinx/cosx. then integrate sinxsecx by parts?
 one year ago

irkizBest ResponseYou've already chosen the best response.0
wait. is the ans lnsecx?
 one year ago

irkizBest ResponseYou've already chosen the best response.0
sec x is (cosx)^1 bring the 1 to the front
 one year ago
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