Uprav a napiš podmínky:

\large \Large \frac{{{{\left( {a-\frac{1}{a}} \right) }^{- 2}}+{{\left( {a+\frac{1}{a}} \right) }^{- 2}}}}{{{{\left( {a-\frac{1}{a}} \right) }^{- 2}}-{{\left( {a+\frac{1}{a}} \right) }^{- 2}}}}\large