Answers to sample problems. - New York University > Courant Institute > Department of Mathematics
Answers to sample problems. 1. Integrate by parts. Z xsinxdx= xcosx+ Z cosxdx= xcosx+sinx+ c 2. Integrate by parts twice. Z x2 exdx= x2 ex Z 2xexdx= x2 ex 2xex+ Z 2exdx= x2 ex 2xex+2ex+ c 3. Sustitute x= siny. Z p 1 x2 dx= Z cosycosydy= 1 2 Z (1+cos ......