ヲカノ over 7 yearsago (x⁴+1)(x+1)(x-1)(x²+1) =(x⁴+1)(x²-1)(x²+1) =(x⁴+1)(x⁴-1) =x⁸-1 (a+b)(a-b) = a²-b² を何度もするだけです Post A Comment