title: \right) doesn't work on LaTeX multiline equation
body: <p>I'm writing an equation on LaTeX and when I want to close the formula with <code>\right)</code> it doesn't work. I'll post my code here to see if anyone can help me:</p>
  
  <pre><code>\begin{equation*}
  \begin{split}
   &amp;\bigtriangledown h=\left( \frac{1}{2}\cdot \cos \left(\frac{1}{2}\cdot x\right) \cdot \cos(y) + \cos(x) \cdot \cos(y),
   \frac{-1}{2} \cdot  \cos\left(\cos \left(\frac{1}{2}\cdot y\right)\right)\cdot \\ &amp;\sin\left(\frac{1}{2} \cdot y\right) - \sin\left(\frac{1}{2}\cdot x\right) \cdot \sin(y) - \sin(x) \cdot \sin(y) \right) 
  \end{split}
  \end{equation*}
  </code></pre>