...<& = \ (cosh x sin x - sinh x cos x). 19. /cosh xw\xdx = \ (sinh x sin x - cosh a; cos x). 20. /sinh x cos x dx = £ (cosh x cos x + sinh x sin x). 21. fe? sin x cos xdx = ^ (sin 2x - 2 cos 2x) e*. 22. /xV <& = - (x4 + Sx4 + 20x" + GOx" + 1 20a; +...