(Dlsecxtan xdx=secx+C (12 )cscxcot xdx=-cscx+C (13 dx arcsin x+c arccos+C 14)「,12k= arctan x+C 1+x -arccot+Cx xdx = x +C  (11) sec tan sec x xdx = − x +C  (12) csc cot csc dx x C x = + −  arcsin 1 1 (13) 2 = −arccosx+C  dx x C x = + +  arctan 1 1 (14) 2 = −arccotx+C 