# FCS # y = tan_(fcs)( x; -1 ) = tan ( x -tan(x- tan ( x - ...#. How do you prove that, piecewise, at y = 1, the tangent is inclined at #33^o 41' 24'' # to the x-axis, nearly?

See explanation and the wholesome Socratic graph.

#(dx)/(dy) = 1 + 1/( 1 + y^2 )

#y' = 1/(dx)/(dy). And so,

#the inclination of he tangent to the x-axis is

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