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PRESENT SATELLITE RADIO NAVIGATION SYSTEMS, THEIR PERFORMANCE AND USER RECEIVER CONCEPTS František Vejražka, Pavel Kovář, Libor Seidl, Petr Kačmařík, Josef
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algebra precalculus - $f(x,y) = _sqrt{x^2+(y-1)^2}+_sqrt{(x-3)^2+(y-4)^2}-_sqrt{x^2+y^2}-_sqrt{(x-1)^2+y^2}_;_;,x,y_in _mathbb{R}$
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