example4

　

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Coordinate geometry

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Limit & derivative

　

	Function y=1(2-). How range is of x?
	, prove that \|f(x)-f(2)\|<\|x-2\| when.
	Function . show its least period, max value and mix value.
	Know , calculate the min value of x+y.
	Know 1<x²-3x+3<7, find the field of x.

　