[AMR] Fix errors

electives/amr/parts/00_basics/02_trigonometry.tex

@@ -5,3 +5,5 @@
 \shortdefinition[Orthogonal vec] $v^\top w = 0$
 
 \shortdefinition[Determinant] $ad - bc$ for mat $[a, b; c, d]$
+
+\shortdefinition[Vec Line Eq] $\vec{p} + \lambda \vec{d}$

electives/amr/parts/00_basics/03_error-propagation.tex

@@ -1,3 +1,4 @@
 \subsection{Error Propagation}
+\label{sec:error-propagation}
 For functions $\vec{f}(\vec{x}) = \mat{A}\vec{x}$, the \bi{linear error propagation}
 is given by $\Sigma^f = A \Sigma^x \A^\top$, with $\Sigma^x$ the uncertanty of $\vec{x}$ (covariance mat.)