A-) Evaluate the integral R 0 sin3 x cos xdx =? (b) Evaluate the integral

A-) Evaluate the integral R π 0 √ sin3 x cos xdx =? 

(b) Evaluate the integral R 2x 2x2−5x−3 =? 

(c) Determine whether the imroper integral R ∞ 2 (x + 1)e −112xdx is convergent or divergent.