Update derivatives.qmd

Typo: missing space broke a latex expression

quarto/derivatives/derivatives.qmd

@@ -495,7 +495,7 @@ We can rearrange $(k(x+h) - k(x))$ as follows:
 $$
 \begin{align*}
 (a\cdot f(x+h) + b\cdot g(x+h)) - (a\cdot f(x) + b \cdot g(x)) &=\\
-\quada\cdot (f(x+h) - f(x)) + b \cdot (g(x+h) - g(x)).         &
+\quad a\cdot (f(x+h) - f(x)) + b \cdot (g(x+h) - g(x)).         &
 \end{align*}
 $$