УКАЖИТЕ ВЫРАЖЕНИЕ КОТОРОЕ ЯВЛЯЕТСЯ КВАДРАТОМ СУММЫ ОДНОЧЛЕНОВ 2 Х И (-У)
1) 4[tex] x^{2} [/tex]+[tex] y^{2}[/tex]
2)(2x-[tex] y^{2} [/tex])
3)(2x+[tex] y^{2} [/tex])
4)4[tex] x^{2} [/tex]-[tex] y^{2}[/tex]
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