[-2(X-y)²]².（y-X）³
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[-2(X-y)²]².（y-X）³[-2(X-y)²]².（y-X）³[-2(X-y)²]².（y-X）³[
[-2(X-y)²]².（y-X）³
[-2(X-y)²]².（y-X）³
[-2(X-y)²]².（y-X）³
[-2(X-y)²]².（y-X）³
=-4（x-y）^4 × （x-y）^3
=-4（x-y）^7
=4(x-y)的4次方 ×[-(x-y)的3次方]
=-4(x-y)的7次方
[-2(x-y)²]².(y-x)³
=-4(x-y)⁴ · (x-y)³
=-4(x-y)⁷