For the tangent lines, just get a strait edge like a ruler and draw short line at each of the points. Finding f' means estimating the slopes of the lines you made.

The lines you make will have slopes that are about 1 at x=-2, 1/3 at x=-1, -1/2 at x=0, -1 at x=1, and -1 again at x=2.

Dec 8th, 2014

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