Estimate Derivative

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The tangent to the graph of at is extended one unit to the right to form a right-angled triangle whose hypotenuse has the slope . Therefore the tangent function of the angle of at is and can be read off the scale to the right of . Read the first two digits from the brown scale and the third digit from the pink Vernier scale, where a pink mark is aligned with a brown mark.

Contributed by: Izidor Hafner (February 2013)
Open content licensed under CC BY-NC-SA


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