√|1-x^2|的积分,积分区间为0-2
问题描述:
√|1-x^2|的积分,积分区间为0-2
别把绝对值给看漏了!
答
大家都真心觉得不难,但是却很啰嗦∫[0,2]√|1-x^2| ,首先分段积分=∫[0,1]√1-x^2 dx+∫[1,2]√x^2-1 dx 对分别换元积分∫[0,1]√1-x^2 dx令x=sint [0,π/2]∫[0,π/2] cos^2tdt=∫[0,π/2] (cos2t+1)/2dt=t/2+sin2t...