diff --git a/education/math/MATH1060 (trig)/Double and Half Angle Identities.md b/education/math/MATH1060 (trig)/Double and Half Angle Identities.md
new file mode 100644
index 0000000..f626c4a
--- /dev/null
+++ b/education/math/MATH1060 (trig)/Double and Half Angle Identities.md	
@@ -0,0 +1,2 @@
+$$ \sin(2\theta) = 2\sin\theta\cos\theta $$
+$$ \cos(2\theta) = \cos^2\theta - \sin^2
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diff --git a/education/software development/ECE1400/Chapter 12 Exercises.md b/education/software development/ECE1400/Chapter 12 Exercises.md
index f8eab3c..503197a 100644
--- a/education/software development/ECE1400/Chapter 12 Exercises.md	
+++ b/education/software development/ECE1400/Chapter 12 Exercises.md	
@@ -24,4 +24,4 @@ The following expressions are illegal because of mismatched types:
 - (a) `p == a[0]` - Comparison between `int *` and `int`
 The rest of the expressions are true.
 
-8. 
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+8.' 
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