∫x⼀1+x^2dx 求不定积分

求详细过程 谢谢
2024-11-23 04:20:51
推荐回答(3个)
回答1:

∫x/(1+x^2)dx
=1/2∫1/(1+x^2)dx^2
=1/2∫1/(1+t)dt
=1/2ln|1+t|+C
=1/2ln(1+x^2)+C

回答2:

∫x/(1+x^2)dx

=1/2∫1/(1+x^2)d(1+x^2)
=1/2ln(1+x^2)+C

回答3:

∫x/(1+x²)dx
=1/2∫2x/(1+x²)d(1+x²)
=(1/2)ln(1+x²)+C