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7.7.4  Tangent to a 2D graph: LineTan

LineTan takes two arguments: an expression Ex of the variable x and a value x0 of x.
LineTan draws the tangent at x=x0 to the graph of y=Ex.
Input:

LineTan(ln(x),1)

Output:

the line y=x-1

Input:

equation(LineTan(ln(x),1))

Output:

y=(x-1)

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