span class="mf">1._rp</span><span class="o">+</span><span class="n">U_X</span><span class="p">(</span><span class="n">cc</span><span class="p">)</span><span class="o">*</span><span class="n">U_X</span><span class="p">(</span><span class="n">cc</span><span class="p">)</span><span class="o">+</span><span class="n">U_Y</span><span class="p">(</span><span class="n">cc</span><span class="p">)</span><span class="o">*</span><span class="n">U_Y</span><span class="p">(</span><span class="n">cc</span><span class="p">