

InterviewSolution
Saved Bookmarks
1. |
Evaluate:`int((e/x)^x+(x/e)^x)1nx dxdot` |
Answer» Let `((x)/(e))^(x)=t` or `(((x)/(e))^(x) "In"(x)/(e)+x*((x)/(e))^(x-1)*(1)/(e))dx=dt` or `((x)/(e))^(x)("In"(x)/(e)+1)dx=dt` or `((x)/(e))^(x) "In"xdx=dt` So, ` I=int((1)/(t^(2))+1)dt= -(1)/(t)+t+C` `=((x)/(e))^(x)-((e)/(x))^(x)+C` |
|