update notes

diff --git a/methods/calculus.md b/methods/calculus.md
index 2d029fb6fe4dd67247be61f635b4e5bf93e5da46..fb19fdbbe08568cc94bf2f1e7e31b040ff08fa22 100644 (file)
--- a/methods/calculus.md
+++ b/methods/calculus.md
@@ -24,7 +24,7 @@ Average rate of change between $x=[a,b]$ given two points $P(a, f(a))$ and $Q(b,
 Tangent to a curve at a point - has same slope as graph at this point.
 Values for $\Delta$ are always approximations.
 
-Secant - line passing through two points on a curve
+Secant - line passing through two points on a curve  
 Chord - line segment joining two points on a curve
 
 Instantaneous rate of change is estimated by using two given points on each side of the concerned point. Evaluate as in average rate of change.
@@ -37,10 +37,8 @@ Each point $Q_n<P$ becomes closer to $Q_P$.
 
 ## Position and velocity
 
-Position - location relative to a reference point
-
-Average velocity - average rate of change in position over time
-
+Position - location relative to a reference point  
+Average velocity - average rate of change in position over time  
 Instantaneous velocity - calculated the same way as averge $\Delta$
 
 ## Derivatives