题目是∫[1/(3sint+sin²t )]dt 还是∫[3sint+sin²(1/t )] dt 请说明一下,不然没法帮你.求不定积分 ：∫（3sint +（1/sint^2t)）dt 求详细过程 拜托大神∫[3sint+(1/sin²t)]dt=3∫sintdt+∫dt/sin²t=-cost-cot(t)+C