Question

Integration

Answer 1

\[\int\limits_{?}^{?}(\cos z)/(\cos z +1)\]

Answer 2

(cosz+1-1)/(cosz+1)=1-(1/(1+cosz))= 1-(1/2)sec^2(z/2)
on integration it yields (z-tanz/2+c) (now one can put the limits)....