Integral: Upper limit is pie/3, lower limit is 0. secxtanx(square root of 1+secx)dx
Sorry if this is confusing, I dont know how to use the real math symbols.
The Attempt at a Solution
I realized it is U-substitution and not the FTC.
u=1+secx dx=sextanx du
when x=0, u=2 & x=pie/3, u=3.
I dont really know what to do after that, I'm a total noob at u-sub. Please help.