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The total area of a page is 150c m^2dot ...

The total area of a page is `150c m^2dot` The combined width of the margin at the top and bottom is `3c m` and the side 2cm. What must be the dimensions of the page in order that the area of the printed matter may be maximum?

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The correct Answer is:
`(sqrt((bA)/(a)-b)) (sqrt((aA)/(b)-a)`
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