$${{\mathtt{2}}}^{-{\mathtt{2}}} = {\frac{{\mathtt{1}}}{{{\mathtt{2}}}^{{\mathtt{2}}}}} = {\frac{{\mathtt{1}}}{{\mathtt{4}}}} = {\mathtt{0.25}}$$
.$${{\mathtt{2}}}^{-{\mathtt{2}}} = {\frac{{\mathtt{1}}}{{{\mathtt{2}}}^{{\mathtt{2}}}}} = {\frac{{\mathtt{1}}}{{\mathtt{4}}}} = {\mathtt{0.25}}$$