求定积分∫-1~1(x^1999cos^2x+1⼀(1+x^2))dx

2025-06-27 19:14:05
推荐回答(1个)
回答1:

定积分偶倍奇零性质,
=0+2∫(0到1)1/(1+x^2)dx
=2arctanx
=π/2