Differentiation: The derivative
The tangent line
Below you see four images of the graph #f(x)=\frac{1}{5} x^2+4# (in blue solid) with a line (in red dashed) through the point #\rv{3,{{29}\over{5}}}#. In which image is the line the tangent line to #f# at #\rv{3,{{29}\over{5}}}#?
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