[tex]c(c + 4d) - (c + d)(c - d) = {c}^{2} + 4cd - {c}^{2} + {d}^{2} = {d}^{2} + 4cd[/tex]
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[tex]c(c + 4d) - (c + d)(c - d) = {c}^{2} + 4cd - {c}^{2} + {d}^{2} = {d}^{2} + 4cd[/tex]