Recent content by superelf83

:biggrin: THANK YOU SO MUCH! :) you are so kind. hehehe

hummm. so... u=sin(lnt) du=cos(lnt)(1/t)dt v=t dv=dt intergration of sin(lnt)dt = tsin(lnt)- ∫tcos(lnt)(1/t)dt (and then do integration by parts again?) could you just tell me if i took the derivative of u correctly? thank you so much by the way~ :)

we are doing 'integration by parts' right now. but we never learned anything like this. (having a function inside a function). would u=lnx du=1/x .. v= ? dv = sin... ? please help.

simple "find the x" question how do you solve for x in this equation? x^3+x^2-x-1=0 i know one of them is 1. but the other one...?

Hi. I'm new here. :) I was wondering if anyone could help me out with this problem... i'm supposed to find the region bounded by: y=x+1 y=e^-x x=1 i think i should find the other point of intersection but i forgot to do that (i haven't taken a math course for about 4 years). please help!