(1/3X²-y)²+(1/3x²+y)²(a+1)²(a-1)²-(a+2)²(a-2)²
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(1/3X²-y)²+(1/3x²+y)²(a+1)²(a-1)²-(a+2)²(a-2)²(1/3X²-y)
(1/3X²-y)²+(1/3x²+y)²(a+1)²(a-1)²-(a+2)²(a-2)²
(1/3X²-y)²+(1/3x²+y)²
(a+1)²(a-1)²-(a+2)²(a-2)²
(1/3X²-y)²+(1/3x²+y)²(a+1)²(a-1)²-(a+2)²(a-2)²
1/3X²-y)²+(1/3x²+y)²
=1/9x4+y4
(a+1)²(a-1)²=【(a+1)(a-1)】²-【(a+2)(a-2)】²=(a²-1)²-(a²-4)²=(a²-1+a²-4)【(a²-1)--(a²-4)】=3(2a-5)