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add or subtract a surd, swap the + or – sign and multiply the numerator and denominator by this expression. For example, if the denominator includes the bracket \((5 + 2\sqrt{3})\), then ...
add or subtract a surd, swap the + or – sign and multiply the numerator and denominator by this expression. For example, if the denominator includes the bracket \((5 + 2\sqrt{3})\), then ...
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