# Perpendicular tangents

**Calculus**Level 4

such that the tangents at these points to \(S\) are perpendicular to the line \[l \ : \ (\sqrt {2}-1)x+y=0.\]

Find the value of \[\left\lfloor \displaystyle\sum_{k=1}^{n} |\alpha_k|-|\beta_k|\right\rfloor.\]

**Details and Assumptions**

\(\lfloor{\cdots}\rfloor\) denotes the floor function (greatest integer function).

Even though in the problem, a plural form of points is given, there may only be one such point that exists.