diff --git a/quarto/integrals/ftc.qmd b/quarto/integrals/ftc.qmd
index 0c7b6da..72922ee 100644
--- a/quarto/integrals/ftc.qmd
+++ b/quarto/integrals/ftc.qmd
@@ -424,7 +424,7 @@ This seems like a lot of work, and indeed it is more than is needed. The followi
 
 
 $$
-\int_0^\pi 100 \sin(x) dx = -100(-\cos(x)) \big|_0^{\pi} = 100 \cos(x) \big|_{\pi}^0 = 100(1) - 100(-1) = 200.
+\int_0^\pi 100 \sin(x) dx = 100(-\cos(x)) \big|_0^{\pi} = 100 \cos(x) \big|_{\pi}^0 = 100(1) - 100(-1) = 200.
 $$
 
 ## The derivative of the integral