diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/10.brainstorming/01.p1/textbook.es.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/10.brainstorming/01.p1/textbook.es.md
index 1bab25236..e276c501d 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/10.brainstorming/01.p1/textbook.es.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/10.brainstorming/01.p1/textbook.es.md
@@ -55,7 +55,7 @@ Las *herramientas matemáticas de los niveles 1 y 2* **$`+`$** :
   ** $`\sin\theta=\dfrac{e^{\,i\theta}-e^{\,-i\theta}}{2i}`$**   
   <br>    
   y unciones hiperbólicas    
-  **$`\cosh(x)=\dfrac{e^x-+e^{\,- x}}{2}`$**   
+  **$`\cosh(x)=\dfrac{e^x+e^{\,- x}}{2}`$**   
   **$`\sinh(x)=\dfrac{e^x-e^{\,- x}}{2}`$**    
 
 * **$`e^0=1 \quad , \quad`$**