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Simplified form of 1/y-1/x divided by 1/y+1/x

User Bated
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( (1)/(y) - (1)/(x) )/( (1)/(y) + (1)/(x) ) = ( (x-y)/(xy) )/( (x+y)/(xy) ) = (x-y)/(x+y)
User Mickey Shine
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