(a2-b2)/(a2+2ab+b2)*(a3+b3)

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(a2-b2)/(a2+2ab+b2)*(a3+b3)(a2-b2)/(a2+2ab+b2)*(a3+b3)(a2-b2)/(a2+2ab+b2)*(a3+b3)(a2-b2)/(a2+2ab+b2)

(a2-b2)/(a2+2ab+b2)*(a3+b3)
(a2-b2)/(a2+2ab+b2)*(a3+b3)

(a2-b2)/(a2+2ab+b2)*(a3+b3)
(a2-b2)/(a2+2ab+b2)*(a3+b3)
=(a-b)(a+b)/(a+b)2*(a+b)(a2-ab+b2)
=(a-b)*(a2-ab+b2)