例3求im 1-cOS x 》0 2 SIn 1-cos x 解 lim 2 x→>0 2 →>0 2 x SIn 21 SIn =-lim 2x→>0 =(im2)2 2x>0x 2 般:lim sinu(r) u(x)→>0 x. 1 cos lim 2 0 x x x − → 求 2 2 0 ) 2 ( 2 sin lim 2 1 x x x→ = 2 2 0 2 0 2 2sin lim 1 cos lim x x x x x→ x→ = − 2 0 ) 2 2 sin (lim 2 1 x x x→ = 例3 解 . 2 1 = 1 ( ) sin ( ) lim ( ) 0 = → u x u x u x 一般：