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1、第四章不定积分一、是非题:已知arcsin x 11 x2,则11 x2dx arcsin x 错2.连续函数的原函数一定存在对3.dfxdx dfxdx错dx4.y lnax和y ln x是同一函数的原函数对y exex和y exex是同一函数的原函数对5.kfxdx kfxdx(k是常数)错22二、填空题:f xdx(ln f(x)C)fxxf xdx(xdf x xf(x)f(x)C)知1fxdx FxC,则fax bdx(F(ax b)C),a,b为常数a已知已知fxdx exC,则fcosxsin xdx(ecos xC)fxdx sin x,则fx(sin x)f xdx(arct
2、anf(x)C)21fx6.设fx、f x连续,则7.设fx的一个原函数为e,则xfln x1dx(C)xx8.函数(1xln(1 x2)C)是的原函数221 xx9.设fxe,则f ln xdx(xC)x三、选择填空:1已知Fx是fx的一个原函数,C 为任意常数,下列等式能成立的是(a)adFx FxC bFxdx Fx cfxdx fxC ddfxdx fxC1Cx下列等式能成立的是(d)aexdx exC bln xdx ccos xdx 21cos3x C dsin2xdx sin2x C3x若fxdx 2sinC,则fx(b)2xxxxacosC bcos c2cosC d2sin2
3、222ln x函数的不定积分是(b)x112ln xln2x Caxln x C bln x C cC d22x四、计算题:2x1x5cosx C 2 5cosdx ln x 3ln23x1x11xe2exdx e exCxcosx1dx 1sin2x1sin2xd sin x arctan(sinx)C(x2 x2)2x4 x4 21111dxdx()dx ln x 4C335xxx4 xx211sec2xsecxd tan x Cdxdx221 tan x(1 tan x)(1 tanx)1 tan xx2arctan x(x211)arctan xarctan xdx dxarctan
4、xdx dx2221 x1 x1 x xarctan x x12dx(arctan x)221 x11 xarctanx ln1 x2(arctanx)2C226x12x3x3xdxdxdxu ()7x令9x 4x3x2x29 4x()()2311111u 1du du lnC1ln3ln2 uln3ln2u212(ln3ln2)u 1u u18xtan xdx 22x(sec x 1)dx xd tan x xtan x lncosx 12x C29sin3xcos2xdx (1cos2x)cos2xd cosx(cos4x cos2x)d cosx11cos5x cos3x C5310co
5、s52xsin4xdx cos52x2sin2xcos2xdx cos52xcos2xd cos2x 111cos72x C7x1 x1dx令x tan2t12tant sec2tdt 2sectdt 2lnsect tant Ctant sect 2ln 1 x x C1211x11tdx令x tt 11314dt 1t2 41t2C31t12tdt 234(1x)2 4(1x)2C3131 xxex21xexxexx e dx exCdx xe d1 x1 x1 xx141sin2xcosxdxsin2x cos2x1cosx1dx()dx lnsecx tan x Ccosxsin2xs
6、in xsin2xcosx15xx 221 x2dxx sintsint 212costdt()dt22sintsin tsin t cost11 x22 1 x2C lncsct cott 2cott C lnxxx16222124x lnxdxln xdx2ln x x2x2dx ln x x2x2C333x393333317ln(x 1)dx xln(x 1)x181dx xln(x 1)ln(x 1)x Cx 1x 11 x2dx 11d(1 x2)arcsin x 1 x2 arcsin x C21 x219ex1ex1e2x5dx 32ex1e2xdx e2x1e2x1dx arcsinex2 1e2xC220 x 31 xdx322ux113313233x 1 xdx u(1u)du(u 11)(1u)3du3335285111133(1u)3du(1u)3du(1 x)3(1 x)3C338521cos2xcos2xsin2xdxcos2xsin2x1sin xdx dxdx332cos xsin x2cos xsin x2cos x11d cosx2cos3x111lncsc2x cot2x C224 cos xcsc2xdx