Step-38: additional typo

git-svn-id: https://svn.dealii.org/trunk@23123 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/examples/step-38/doc/intro.dox b/deal.II/examples/step-38/doc/intro.dox
index 308df9ee920eeb2e5d75b5d59bb0579721678d0a..1dd7ace34df5ec864a0f39dadf827f9a7a21761a 100644 (file)
--- a/deal.II/examples/step-38/doc/intro.dox
+++ b/deal.II/examples/step-38/doc/intro.dox
@@ -166,7 +166,7 @@ We produce one test case for a 2d problem and another one for 3d:
   @f{align*}
     \Delta_\Gamma u 
     &= \frac{d^2}{dt^2}(-2\cos t \sin t)
-    = -2 \frac{d}{dt}(-sin^2 t + \cos^2 t)
+    = -2 \frac{d}{dt}(-\sin^2 t + \cos^2 t)
     = -2 (-2 \sin t \cos t - 2 \cos t \sin t)
     \\
     &= 8 \sin t \cos t