只是这恐怕不能初等积分,可有级数解:
原式=∫[1-x^2+x^4/2!-x^6/3!+x^8/4!-....]dx
=x-x^3/3!+x^5/(5*2!)-x^7/(7*3!)+x^9/(9*4!)-.........+C
匿名回答于2024-05-24 20:06:33