Question

[(X+Y)^2  - (X-Y)^2] :4XY   

Answer 1

$<var>\frac{(x+y)^{2}-(x-y)^{2}}{4xy}\\ \\ fatorando\ o\ numerador \ pela\ diferenca\ de\ quadrados\\ \frac{(x+y+x-y)[x+y-(x-y)]}{4xy}\\ \\ \frac{(2x)[x+y-x+y)]}{4xy}\\ \\ \frac{(2x)(2y)}{4xy}\\ \\ \frac{4xy}{4xy}\\ \\ 1</var>$