[spec] partial fractions

diff --git a/spec/calculus.md b/spec/calculus.md
index 01218996b723a7650e38ea770fb8150b31481855..671f0fa42841a8366c20c6b7fcf868773f68db84 100644 (file)
--- a/spec/calculus.md
+++ b/spec/calculus.md
@@ -290,7 +290,11 @@ Use identities:
 
 - $\sin^2x={1 \over 2}(1-\cos 2x)$
 - $\cos^2x={1 \over 2}(1+\cos 2x)$
-- $\sin 2x = 2 \sin x \cos x
+- $\sin 2x = 2 \sin x \cos x$
+
+### Partial fractions
+
+On CAS: Action $\rightarrow$ Transformation $\rightarrow$ `expand/combine`
 
 
 ## Applications of antidifferentiation