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\left(xy-4\right)\left(xy+4\right)
Tuhia anō te x^{2}y^{2}-16 hei \left(xy\right)^{2}-4^{2}. Ka taea te rerekētanga o ngā pūrua te whakatauwehe mā te ture: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).