title: latex large division sign in a math formula
body: <p>I have been looking for an answer for some time now, hope you could give me a quick tip.</p>
  
  <p>I have an equation with many divisions inside. i.e:</p>
  
  <pre><code>$\frac{\frac{a_1}{a_2}} {\frac{b_1}{b_2}}$
  </code></pre>
  
  <p>To make it more readable, I decided to change the large fraction into "/" sign. i.e.</p>
  
  <pre><code>$\frac{a_1}{a_2} / \frac{b_1}{b_2}$
  </code></pre>
  
  <p>The problem is that the "/" sign remains small, and it is quite ugly.</p>
  
  <p>How do I change the "/" sign to have a big font? How do I make it more readable?</p>