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x→0
lim 1-(1-2sin^2 1/2) (x+2)/ (x+2)^2
x→0
lim 2sin^2 1/2 (x+2)/ (x+2)^2..
x→0
2 lim sin 1/2 (x+2) /(x+2).lim sin 1/2 (x+2) /(x+2)
x→0 x→0
=2.1/2.1/2=1/2