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x⁶-16x⁴+x⁴-16=0
x⁴(x²+1)-16(x²+1)(x²+1)=0
x⁴(x²+1)-16(x²+1)(x²+1)=0
(x⁴-16)(x²+1)(x²+1)=0
rozw. x=2∨-2∨1∨-1
8x⁶-7x³-1=0
8x⁶-8x³+x³-1=0
8x³(x³-1)+1(x³-1)=0
(8x³+1)(x³-1)=0
rozw. x=1/2∨1