高数不定积分
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∫[(x^3+x^2+2)/(x^2+2)^2]dx
=∫[(x^3+2x)/(x^2+2)^2]dx+∫[(x^2+2)/(x^2+2)^2]dx
-∫[2x/(x^2+2)^2]dx
=∫[x/(x^2+2)]dx+∫[1/(x^2+2)]dx-∫[1/(x^2+2)^2]d(x^2+2)
=(1/2)∫[1/(x^2+2)]d(x^2+2)+(√2/2)∫{1/[(x/√2)^2+1]d(x/√2)
+1/(x^2+2)
=(1/2)ln(x^2+2)+(√2/2)arctan(x/√2)+1/(x^2+2)+C。
=∫[(x^3+2x)/(x^2+2)^2]dx+∫[(x^2+2)/(x^2+2)^2]dx
-∫[2x/(x^2+2)^2]dx
=∫[x/(x^2+2)]dx+∫[1/(x^2+2)]dx-∫[1/(x^2+2)^2]d(x^2+2)
=(1/2)∫[1/(x^2+2)]d(x^2+2)+(√2/2)∫{1/[(x/√2)^2+1]d(x/√2)
+1/(x^2+2)
=(1/2)ln(x^2+2)+(√2/2)arctan(x/√2)+1/(x^2+2)+C。
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