Question

(a-b) (a + b)-(a + b) (a + b)
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Answer 1

Answer:

(a-b)(a+b)-(a+b)(a+b)

a^2-b^2-a^2+2ab+b^2=2ab

Answer 2

Answer:

(a^2-b^2)-(a^2+b^2)

I hope it's helps for you