Розв’язати біквадратне рівняння:
1. [tex]x^{4}[/tex] – 5[tex]x^{2}[/tex] + 4 = 0;
2. [tex]x^{4}[/tex] + 5[tex]x^{2}[/tex] + 4 = 0;
3. [tex]x^{2}[/tex] - 8[tex]x^{2}[/tex] + 16 = 0.
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