r-pr">#&gt;</span>                      ⎥</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                      ⎥</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>    exp(2⋅b₁⋅(x - x₀))⎥</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>    ──────────────────⎥</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                3     ⎥</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>     - x₀)) +