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a) {{formula}} (a+b)(a-b) = a^2 - ab + ba - b^2 = a^2 - b^2{{/formula}} |
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b) {{formula}} -(a + 2) (b - 2) = -(ab-2a+2b-4) = ab+2a-2b-4{{/formula}} |
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c) {{formula}} \frac{2}{3} (9a-6b) = 6a-4b{{/formula}} |
