diff --git a/education/math/MATH1210 (calc 1)/Derivatives.md b/education/math/MATH1210 (calc 1)/Derivatives.md
index 946f6fd..bce636f 100644
--- a/education/math/MATH1210 (calc 1)/Derivatives.md	
+++ b/education/math/MATH1210 (calc 1)/Derivatives.md	
@@ -121,7 +121,15 @@ $$ \dfrac{d}{dx} \sin x = \cos x$$
 $$ \dfrac{d}{dx} \cos x = -\sin x $$
 
 ## Tangent
-$$ \dfrac{1}{\cos^2x}$$
+$$ \dfrac{d}{dx} \tan x = \sec^2x $$
+## Secant
+$$ \dfrac{d}{dx} \sec x = \sec x * \tan x $$
+
+## Cosecant
+$$ \dfrac{d}{dx} \csc x = -\csc x \cot x $$
+## Cotangent
+$$ \dfrac{d}{dx} \cot x = -\csc^2 x $$
+
 
 # Examples