(4) dx=arctan+c: 1+x 5 dx= arcsinx+cs x2 (6)cos xdx=sin x+C; (sin xdx=-cosx+C: dx i sec xdx=tanx+C cos 9)∫ d csc xdx =-cotx+C, SIn= +  dx x 2 1 1 (4) arctan x + C; = −  dx x 2 1 1 (5) arcsin x + C; (6)  cos xdx = sin x + C; (7)  sin xdx =− cos x + C; =  x dx 2 cos (8)  xdx = 2 sec tan x + C; =  x dx 2 sin (9)  xdx = 2 csc − cot x + C;