计算下列不定积分:
(1)∫(x2-1/x2+√x/2)dx;
(2)∫(x2+1)2dx;
(3)∫(√x+1)(x-1)dx;
(4)∫(2-sec2x)dx;
(5)∫[3x-2/√(1-x2)]dx;
(6)∫22x3xdx;
(7)∫(1-1/x2)√x√xdx;
(8)∫[(1-e2x)/(1-ex)]dx
(9)∫ex[1-e-x/(1+x2)]dx;
(10)∫cot2xdx
(11)∫[x2/(1+x2)]dx;
(12)∫[(1+x+x2)/x(1+x2)]dx
(13)∫cos2(x/2)dx;
(14)∫secx(secx-tanx)dx;
(15)∫[cos2x(cosx-sinx)]dx;
(16)∫dx/(1+sinx)
(17)∫(cos2x/sin2xcos2x)dx