Factorise the x^8 -216
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x^8-216
x^8-256+40
x^8-2^8+40
(x⁴)²-(2⁴)²+40
(x⁴+2⁴)(x⁴-2⁴)+40
x^8-256+40
x^8-2^8+40
(x⁴)²-(2⁴)²+40
(x⁴+2⁴)(x⁴-2⁴)+40
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