二.2.y"=p(x),y=p'(x) P=v 1+P dp 1+p arcshp=x+Cl p=sh(r+C y=sh(x+C y'=ch(x+C1+C2 y=sh(x+C1+C2*+C3 K心二. 2. y = p(x), y = p(x), 1 , 2 p = + p dx p dp = + 2 1 1 arcshp = x + C ( ) 1 p = sh x + C ( ) 1 y = sh x + C ( ) 1 2 y = ch x + C + C ( ) 1 2 3 y = sh x + C + C x + C