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12 March, 12:46

1/f=1/a+1/b solve for f

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  1. 12 March, 13:06
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    1/f = 1/a+1/b

    RHS = b+a/ab (taking LCM)

    Cross-multiplication: 1/f=a+b/ab

    =>ab = (a+b) f

    =>f=ab/a+b
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