Преобразование выражения:
[tex]( \frac{ m^{2} +n^{2} }{m^{2}n^{2}} *( \frac{1}{m^{2}} - \frac{1}{n^{2} } )-( \frac{1}{p^{2} } - \frac{1}{n^{2} }) * \frac{p^{2}+n^{2}}{p^{2}n^{2}} ): \frac{p^{2} +m^{2}}{p^{2}m^{2}} [/tex]