华中师范大学专用
(5)
exsin2xdx
=12ex 1
2
excos2xdx=1
11ex excos2x exsin2x+C2. f(x)=sinx
,¦xf (x)dx):
xf (x)dx=
xdf (x)
=xf (x)
f (x)dx=xf (x) f(x)+C
=cosx 2sinx
x
+C.3. f(x)=xex§¦
f (x)lnxdx. f (x)lnxdx
=
lnxdf(x)
=f(x)lnx
f(x)
xdx=f(x)lnx
exdx=xexlnx ex+C.
19
(0.51)
(0.52)
(0.53)