1.

Find coefficient of x^12 in 4+2x-x²/(1+x)³.

Answer» 4 + 2x\xa0- x2 (1 - x3)4 + 2x - x2 (1 - x3 - 3x2 + 3)4 + 2x - x2 + x6 + 3x4 - 3x2x6+ 3x4 - 4x2 + 2x + 4so, coefficient of x12 os 0


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