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If H be the H.M. between a and b. prove that 1/H-a + 1/H-b = 1/a+1/b​
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If H be the H.M. between a and b.
prove that 1/H-a + 1/H-b = 1/a+1/b​

User Matt Kahl
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if susjwmaoakkaajKIJahabsbzh

User Andrew Whitehouse
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