(13)∫adx= +C In a (20)-22dx=arctan +C +x (14)「shd=chx+C (21) ∫ 22(k=1nx-a +o (15)「 chad=shx+C 2ax+a 1,a+y (0)∫mnt=- in cosx+C (22) dx In +C a-x 2a a-x (17)cot xx=Insinx+C (23)∫2、24x= arcsin+C a- (18)sec xdx=In(sec x+tanx)+C 工工 (24) dx x2±a (19)csc xdx= In(csc x-cot x)+C =In(x+√x2±a2)+C 上页 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 (15)  chxdx = shx +C