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(8) dx=I sec xdx= tan x+C COS X (9) dx= csc2 xdx=-cot x+C sIn x (10) sec x tan xdx =sec x+C, (11)csc x cot xdx=-CsC x+C. 1 dx=arctan x+C, (13) dx= arcsin x+ 冈凶(8)  x = x x = x +C x d sec d tan cos 1 2 2 , (9)  x = x x = − x +C x d csc d cot sin 1 2 2 , (10) sec x tan xdx = sec x +C, (11) csc x cot xdx = −csc x +C, (12) x x C x = + +  d arctan 1 1 2 , (1 3) x x C x = + −  d arcsin 1 1 2
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