It is sec2.
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The derivative of ( \ln x ) is ( \frac{1}{x} ) for ( x > 0 ). This means that as ( x ) increases, the slope of the tangent line to the curve ( y = \ln x ) at any point ( x ) is given by ( \frac{1}{x} ).
A common tangent is a line which is tangent to two (or more) curves.
Tangent 39 = 0.809784033195
tangent(450) = 0.935809013
196-164/2= 16