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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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