3(tan x) sin x(sin x) cosx-sin x(cosx cos cosx+sin x sec d cos d 同理:(cotx)"=-csc2x 1(cos x) sinx (4)(ecx) tanx secx cosx cos X cos d 同理:(cscx)=-cotx·cscx (5)υ’(1-c0sx)(-x)-(1-cosx)(1-x) (1-x)2 (1-x)sin x+(1-cos x)7 sin (3) (tan ) cos x x x     =     1 (4) (sec ) cos x x     =     2 (1 cos ) (1 ) (1 cos )(1 ) (5) (1 ) x x x x y x − − − − −    = − 2 (sin ) cos sin (cos ) cos x x x x x   − = 2 2 2 2 cos sin sec cos x x x x + = = 2 (cos ) cos x x −  = 2 sin tan sec cos x x x x = =  同理: (csc ) cot csc x x x  = −  2 (1 )sin (1 cos ) . (1 ) x x x x − + − = − 2 同理: (cot ) csc x x  = −