fixed minor mistake in formula

sections/appendix.tex

@@ -87,8 +87,7 @@ We now expand the bracket on the left-hand side using the equations \ref{eq:va2}
 \]
 Using the triple scalar product rule, we can derive that
 \[
-	j \left( 1/m_a + 1/m_b + \frac{\left(( \vec r_{ap} \times \vec n
-			)^2\right)}{I_a} + \frac{\left( \vec r_{bp} \times \vec n \right)^2}{I_b}
+	j \left( \frac{1}{m_a} + \frac{1}{m_b} + \frac{\left(\vec r_{ap} \times \vec n\right)^2}{I_a} + \frac{\left( \vec r_{bp} \times \vec n \right)^2}{I_b}
 	\right) = -(1+e) \vec v_{p1} \cdot \vec n
 \]
 and therefore