∫1/(e^x-e^-x)dx= ∫e^x/(e^2x-1)dx令t=e^x x=lnt dx=1/tdt原式=∫[t/(t^2-1)]*(1/t)dt=∫[1/(t^2-1)]dt=(1/2)∫{[1/(t-1)]-[1/(t+1)]}dt=(1/2){∫[1/(t-1)]d(t-1)-∫[1/(t+1)]}d(t+1)}=(1/2){ln|t-1|-ln|t+1|}+c=l...