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Tohaina

\left(xy-2\right)\left(xy+2\right)
Tuhia anō te x^{2}y^{2}-4 hei \left(xy\right)^{2}-2^{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).