4(ab+cd)²-(a²+b²-c²-d²)²16+24(a-b)+9(a-b)²

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4(ab+cd)²-(a²+b²-c²-d²)²16+24(a-b)+9(a-b)²

4(ab+cd)²-(a²+b²-c²-d²)²16+24(a-b)+9(a-b)²
4(ab+cd)²-(a²+b²-c²-d²)²
16+24(a-b)+9(a-b)²

4(ab+cd)²-(a²+b²-c²-d²)²16+24(a-b)+9(a-b)²
4(ab+cd)²-(a²+b²-c²-d²)²
=2²(ab+cd)²-(a²+b²-c²-d²)²
=<2(ab+cd)+(a²+b²-c²-d²)><2(ab+cd)-(a²+b²-c²-d²)>
=
=(a+b+c-d)(a+b-c+d)(c+d+a-b)(c+d-a+b)
16+24(a-b)+9(a-b)²
=4²+2*4*3(a-b)+3²(a-b)²