example8

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Coordinate geometry

Limit & derivative

　

	f(x)= . Show its limit, when x ->0.
	Show the limit of 2lnx+,when x ->0.
	Get line segment OQ in x axis and makes it equal to the length of chord OP of curve y=x ^2which passes through O. Make line PQ. It intersects y axis in R. When P move to O, where will R go?.
	f(x)= . Find the slope of graph of f(x) at point 1.
	Show the derivative of y=3x-.

　