求不定积分 (1-√x-1)/1+三次根号下x-1

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求不定积分(1-√x-1)/1+三次根号下x-1求不定积分(1-√x-1)/1+三次根号下x-1求不定积分(1-√x-1)/1+三次根号下x-1设(x-1)^(1/6)=t,则x=1+t^6,dx=6

求不定积分 (1-√x-1)/1+三次根号下x-1
求不定积分 (1-√x-1)/1+三次根号下x-1

求不定积分 (1-√x-1)/1+三次根号下x-1
设 (x-1)^(1/6)=t,则 x=1+t^6,dx=6t^5;
∫[1-√(x-1)]/[1+(x-1)^(¹/³)]dx=∫[(1-t³)/(1+t²)]*(6t^5)dt=6∫(1-t-t²+t³ +t^4 -t^6)+[(t-1)/(1+t²)] dt
=6t-3t²-2t³+(3t^4 /2)-(6t^7 /7)+6∫[(t-1)/(1+t²)]dt
=6t-3t²-2t³+(3t^4 /2)-(6t^7 /7)+3ln(1+t²)-6arctant+C;
将 t 重新换为 (x-1)^(¹/6) 即可:
=6(x-1)^(¹/6)-3(x-1)^(¹/³)-2√(x-1) +(3/2)(x-1)^(²/³)-(6/7)(x-1)(x-1)^(¹/6)+3ln[1+(x-1)^(¹/³)]-6arctan[(x-1)^(¹/6)]+C;