\left. \begin{array} { r } { 540 dm ^ { 2 } } \\ { + 135 dm ^ { 2 } } \end{array} \right.
Evaluate
675dm^{2}
Differentiate w.r.t. d
675m^{2}
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675dm^{2}
Combine 540dm^{2} and 135dm^{2} to get 675dm^{2}.
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