diff --git a/education/math/MATH1210 (calc 1)/Derivatives.md b/education/math/MATH1210 (calc 1)/Derivatives.md
index c453697..ac075e4 100644
--- a/education/math/MATH1210 (calc 1)/Derivatives.md	
+++ b/education/math/MATH1210 (calc 1)/Derivatives.md	
@@ -197,7 +197,8 @@ $$ \dfrac{d}{dx} \sec x = \sec x * \tan x $$
 $$ \dfrac{d}{dx} \csc x = -\csc x \cot x $$
 ## Cotangent
 $$ \dfrac{d}{dx} \cot x = -\csc^2 x $$
-
+## Arcsin
+$$ \dfrac{d}{dx}(\arcsin(x) = \dfrac{1}{\sqrt{1-x^2}}$$
 # Implicit Differentiation
 - There's a reason differentials are written like a fraction
 - $\dfrac{d}{dx} x^2 = \dfrac{d(x^2)}{dx}$, or, "the derivative of $x^2$ with respect to $x$"