详细步骤随后令x=atantdx=asec²t dt原式=∫asect*asec²t dt=∫sect dtant,a²先省略=secttant - ∫tantdsect=secttant - ∫tant(secttant)dt=secttant - ∫sec³tdt + ∫sect dt∵2∫sec³t d...