求不定积分,x^3⼀根号(1+x^2)

2025-01-21 01:51:02
推荐回答(2个)
回答1:


见图

回答2:

换元x=tant,
=∫tan³t/sectdtant
=∫tan³tsectdt
=∫tan²tdsect
=∫sec²t-1dsect
=sec³t/3-sect+C