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if a, b, c are in H. P., prove that (1/a...

if `a, b, c` are in `H. P.,` prove that `(1/a+1/b-1/c)(1/b+1/c-1/a)=4/(ac)-3/b^2`

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The correct Answer is:
` = 1/(b^(2))-[(2/b)^(2)-4/(ac)] =4/(ac)-3/(b^(2))`
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