1. The problem statement, all variables and given/known data solve ∫log(1+acosx) by differentiation under integral sign (limits are 0 to ∏) 2. Relevant equations 3. The attempt at a solution =∫(1/1+acosx)cosxdx(by leibinitz by differentiating partially WRT a. Then how do I proceed,can any one show me all the steps of reduction to standard integral forms??