Differentiation: The derivative
The tangent line
Below you see four images of the graph #f(x)=\frac{1}{8} x^2+3# (in blue solid) with a line (in red dashed) through the point #\rv{2,{{7}\over{2}}}#. In which image is the line the tangent line to #f# at #\rv{2,{{7}\over{2}}}#?
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