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A millimetre (symbol mm) is an SI unit of length that is equal to one thousandth of a metre.
1 mm ie equal to:
See 1 E-3 m for comparisons.
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... it a perfect square trinomial of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...