84.「cosxdx=sinx+C 85.tan xdx=-In cosx+C 86. [cot xdx Insinx+C 87. ∫Sscxdx=-lnan经+c=Ineex+tam时+C 88. fesexdst 89.「sec2xdr=tanx+C 90. ∫csc2xdr=-cotx+C 91.sec xtanxdx=secx+C 92.[cscxcotxdx =-cscx+C 93.∫sin2xdr=x-1s sin2x+C 24 94.∫cos2dr=+ sin2x+C 24 95.fsinsinxcsinxd 1 96.[cos"xdx=-cos"-xsinx+ n l∫cos2xd n 97. sin"x n-1 sin"-x n-1J sin"-2x 98. sinx n-2 dx cos"x n-1 cos"-1 x n-1J cos"-2x 99. [cos"xsin"xdx=1cosxsin[cosxsin"xdx m+n m+nJ 、1 cosm xsinx1 cos"xsin"-2 xdx m+n m+n 1 l00.「sinax cos bxdx=- 1 cos(a+b)x- cos(a-b)x+C 2(a+b) 2(a-b)84. cos dx x =sin x C 85. tan dx x = ln cos x C 86. cot dx x =ln sin x C 87. sec dx x =ln tan( ) 4 2 x C =ln sec tan x x C 88. csc dx x =ln tan 2 x C =ln csc cot x x C 89. 2 sec dx x = tan x C 90. 2 csc dx x = cot x C 91. sec tan d x x x =sec x C 92. csc cot d x x x = csc x C 93. 2 sin dx x = 1 sin 2 2 4 x x C 94. 2 cos dx x = 1 sin 2 2 4 x x C 95. sin d n x x = 1 1 1 2 sin cos sin d n n n x x x x n n 96. cos d n x x = 1 1 1 2 cos sin cos d n n n x x x x n n 97. d sinn x x = 1 2 1 cos 2 d 1 sin 1 sin n n x n x n x n x 98. d cosn x x = 1 2 1 sin 2 d 1 cos 1 cos n n x n x n x n x 99. cos sin d m n x x x = 1 1 1 1 2 cos sin cos sin d m n m n m x x x x x m n m n = 1 1 1 1 2 cos sin cos sin d m n m n n x x x x x m n m n 100. sin cos d ax bx x = 1 1 cos( ) cos( ) 2( ) 2( ) a b x a b x C a b a b