Factorise : (x+2)²-(y+2)²
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(x+2)²-(y+2)²
= (x+2+y+2){x+2-(y+2)}
= (x+y+4)(x+2-y-2)
= (x+y+4)(x-y)
Identity used:- [(a²-b²) = (a+b)(a-b)]
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