\frac{m^{2}-n^{2}}{m^{2}} :(m^{2}+mn)= \frac{ (m-n)*(m+n)}{m^{2}} * \frac{1} {(m^{2}+mn)} = \frac{ (m-n)*(m+n)}{m^{2}} * \frac{1} {(m*(m+n)}=\frac{ (m-n)*(m+n)}{m^{2}*(m*(m+n))} =\frac{ m-n}{m^{3}} [/tex]
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\frac{m^{2}-n^{2}}{m^{2}} :(m^{2}+mn)= \frac{ (m-n)*(m+n)}{m^{2}} * \frac{1} {(m^{2}+mn)} = \frac{ (m-n)*(m+n)}{m^{2}} * \frac{1} {(m*(m+n)}=\frac{ (m-n)*(m+n)}{m^{2}*(m*(m+n))} =\frac{ m-n}{m^{3}} [/tex]