答:
1.原式
=∫ 1/[(x+1)^2+4] dx
=1/4 ∫ 1/[((x+1)/2)^2+1] dx
=1/2*arctan[(x+1)/2] + C
2.原式
=1/2 ∫ 1/x-x^6/(x^7+2) dx
=1/2[ln|x|-1/7*ln|x^7+2|] + C
=1/2ln|x|-1/14ln|x^7+2| + C
答:
1.原式
=∫ 1/[(x+1)^2+4] dx
=1/4 ∫ 1/[((x+1)/2)^2+1] dx
=1/2*arctan[(x+1)/2] + C
2.原式
=1/2 ∫ 1/x-x^6/(x^7+2) dx
=1/2[ln|x|-1/7*ln|x^7+2|] + C
=1/2ln|x|-1/14ln|x^7+2| + C