Evaluate the following integrals:

(i)


(ii)


i)



1-cosx=2sin2x/2 and 1+cosx=2cos2x/2




Now sec2(x/2)-1=tan2(x/2)




2tan(x/2)-x+c


Ans: 2tan(x/2)-x+c


(ii)



1-cosx=2sin2x/2 and 1+cosx=2cos2x/2




Now cosec2 (x/2)-1=cot2 (x/2)




-2cot(x/2)-x+c


Ans: -2cot(x/2)-x+c


1