diff --git a/Math Poster Complete.tex b/Math Poster Complete.tex
index 2cd47a9..81c185b 100644
--- a/Math Poster Complete.tex	
+++ b/Math Poster Complete.tex	
@@ -408,7 +408,7 @@
 \begin{gather*}
    \text{Differentiating both sides with the chain rule you get}
    \\
-   \frac{\partial{F}}{\partial{x}}\frac{dx}{dt} + \frac{\partial{F}}{\partial{y}}\frac{dy}{dt} + \frac{\partial{F}}{\partial{y}}\frac{dy}{dt} = 0
+   \frac{\partial{F}}{\partial{x}}\frac{dx}{dt} + \frac{\partial{F}}{\partial{y}}\frac{dy}{dt} + \frac{\partial{F}}{\partial{z}}\frac{dy}{dt} = 0
    \\
    <\frac{\partial{F}}{\partial{x}}, \frac{\partial{F}}{\partial{y}}, \frac{\partial{F}}{\partial{z}}>\cdot<\frac{dx}{dt}, \frac{dy}{dt}, \frac{dz}{dt}> = 0
    \\
@@ -624,4 +624,4 @@
     \\
     a_n=\frac{|r'(t)\times r''(t)|}{|r'(t)|}        &\quad &\text{7, Algebra}
 \end{alignat}
-\end{document}
\ No newline at end of file
+\end{document}