- #76

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defined as the limit of $$ \frac {R(y_0 + \Delta y) - R(y_0)} {\Delta y} $$ when ## \Delta y \to 0 ## ???

You wrote:

Well, we found the tension when ## y = 0 ## :## \frac {R(y_0 + \Delta y) - R(y_)} {\Delta y} ##

[tex] R(0) = kc ( a\frac{1}{ \sqrt{ c^2 - b^2 } } -1 ) [/tex]