diff --git a/education/math/MATH1060 (trig)/Addition and Subtraction.md b/education/math/MATH1060 (trig)/Addition and Subtraction.md
index d90059b..aebf144 100644
--- a/education/math/MATH1060 (trig)/Addition and Subtraction.md	
+++ b/education/math/MATH1060 (trig)/Addition and Subtraction.md	
@@ -1,3 +1,4 @@
 Given the formula $\sin(\alpha + \beta)$:
-
-$$ \sin()
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+$$ \sin(\alpha + \beta) = \sin(\alpha)\cos(\beta) + \cos(\alpha)\sin(\beta) $$
+Given the formula $\cos(\alpha + \beta)$:
+$$ \cos(\alpha + \beta) = 
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