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Geometry Level 5

If the value of the given expression is a, then what is \(\lfloor a \rfloor\)?

Details And Assumptions:

\(x,y\) are cartesian plane co-ordinates.
Expression given here is a real-valued one, not complex-valued.
\(sin^{-1}x,cos^{-1}x\) are defined on \([-1,1]\)

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