(13)「a2atx +c In a (20 dx=-arctan -+c a +x (14)shed=chx +C X-a (21) sdx +c (15)chxdx=shx +C 2a x+a ax (16) tan xdx=-In cosx+C (22)-22x +c 2a a-x 17)「 cot xdx= Insinx+C (23) -dx= arcsin -+C a -x (18) sec xdr=In(secx+tanx)+C x2±a (19)csc xdx=In(cscx-cot x)+C ln(x+√x2±a2)+C a dx = x (13) C a a x + ln  (16) tan xdx = −lncos x +C  (17) cot xdx = lnsin x +C  (18) sec xdx = ln(sec x + tan x) +C  (19) csc xdx = ln(csc x − cot x) +C C a x a dx a x = + +  arctan 1 1 (20) 2 2 C a x a x a dx a x + − + = −  ln 2 1 1 (22) 2 2 C a x dx a x = + −  arcsin 1 (23) 2 2 x x a C dx x a = +  +   ln( ) 1 (24) 2 2 2 2 C x a x a a dx x a + + − = −  ln 2 1 1 (21) 2 2 x +C  (14) shxdx = ch xdx = x +C  (15) ch sh