diff --git a/education/math/MATH1060 (trig)/Double and Half Angle Identities.md b/education/math/MATH1060 (trig)/Double and Half Angle Identities.md
index c92bc46..122ab8f 100644
--- a/education/math/MATH1060 (trig)/Double and Half Angle Identities.md	
+++ b/education/math/MATH1060 (trig)/Double and Half Angle Identities.md	
@@ -20,4 +20,4 @@ $$ \sin(\frac{\theta}{2}) = \pm\sqrt{\frac{1-\cos\theta}{2}} $$
 Cosine:
 $$ \cos(\frac{\theta}{2}) = \pm \sqrt{\frac{1 + \cos\theta}{2}} $$
 Tangent:
-$$
\ No newline at end of file
+$$ \tan(\frac{\theta}{2}) = \pm\sqrt{\frac{1-\cos\theta}{1 + \cos\theta}} $$
\ No newline at end of file