Hey Guys can you give me some guiding points for a few questions. Trying to refresh myself with doing this kind of work.

1 I) Find Integral of 1/(Cos^2(X)) and 1/(Sin^2(X))

II) Integrate Cos(X)+ [Sin(X)] DX with limits Pie and -Pie. I know the answer is 4 for this but can't get the working right.

III) Similarly Integrate ([u-1]+[u+1]) DU with limits 4 and -3.

With [] symbolosing postive squareroots.

Thanks for any help and apologies for the lay out but any help would be greatly appreciated.