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factorise: 16a²b - b/16a²

$16 a^{2} b - \frac{b}{16 a^{2}} = b (16 a^{2} - \frac{1}{16 a^{2}}) = b [(4 a)^{2} - (\frac{1}{4 a})^{2}] = b^{2} (4 a - \frac{1}{4 a}) (4 a + \frac{1}{4 a}) [∵ x^{2} - y^{2} = (x - y) (x + y)]$

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