华中师范大学专用
2x+1 5x 1
(6)
dx=
10x
2(1x11x
5) 5(2)dx
=2 (1)xdx 1
15(2
)x5dx
=2(1)x
1(1)xln
5ln+C= 2ln55 x+15ln22 x+C.(7) secx(secx tanx)dx=
(secx secxtanx)dx
=tanx secx+C.(8) cos2x
cosx sinxdx
=
(sinx+cosx)dx
=sinx cosx+C.2.y=ln|x|+1.3.(1)27m,
(2)2√3(0.20)
(0.21)
(0.22)
10