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11 July, 09:53

Prove that the geometric mean of two real numbers a and b, is greater than or equal to the harmonic mean of a and

b.

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  1. 11 July, 11:37
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    Note that the inequality is only true when a and b are both the same sign (because the geometric mean requires a*b to be positive).

    This allows us to take the square root of the inequality in step 6 without worrying about a negative radicand.
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