Найдите все значения параметра а, при которых система
[tex]\left \{ {{(3-2\sqrt{2})^y+(3+2\sqrt{2})^y-3a=x^2+6x+5, } \atop {y^2-(a^2-5a+6)x^2=0,}}\atop {-6\leq x\leq 0 }} \right.[/tex]
имеет единственное решение.
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