diff --git a/docs/sph3u7.md b/docs/sph3u7.md
index c514a03..39f1492 100644
--- a/docs/sph3u7.md
+++ b/docs/sph3u7.md
@@ -210,7 +210,7 @@ $$
 The length of resultant vector can then be found using the Pythagorean theorem.
 
 $$
-|\vec{c}|=\sqrt{(c_{x})^2 + (c_{y})^2}
+|\vec{c}|=\sqrt{c_{x}^2 + c_{y}^2}
 $$
 
 To find the resultant direction, use inverse tan to calculate the angle of the vector using the lengths of its components.