Differentiation: The derivative
              The tangent line
  The tangent line 
                    
    Below you see four images of the graph #f(x)=\frac{1}{5} x^2+5# (in blue solid) with a line (in red dashed) through the point #\rv{3,{{34}\over{5}}}#. In which image is the line the tangent line to #f# at #\rv{3,{{34}\over{5}}}#?
                        
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