1 files changed, 0 insertions, 4 deletions
diff --git a/content/know/concept/electromagnetic-wave-equation/index.pdc b/content/know/concept/electromagnetic-wave-equation/index.pdc
index 84946bb..59e0125 100644
--- a/content/know/concept/electromagnetic-wave-equation/index.pdc
+++ b/content/know/concept/electromagnetic-wave-equation/index.pdc
@@ -58,9 +58,7 @@ and substitute $\nabla \cross \vb{E}$ according to Faraday's law:
 
 $$\begin{aligned}
     \nabla \cross (\nabla \cross \vb{B})
-    %= \nabla \cross \Big( \mu_0 \mu_r \varepsilon_0 \varepsilon_r \pdv{\vb{E}}{t} \Big)
     = \mu_0 \mu_r \varepsilon_0 \varepsilon_r \pdv{t} (\nabla \cross \vb{E})
-    %= \mu_0 \mu_r \varepsilon_0 \varepsilon_r \pdv{t} \Big( \!-\! \pdv{\vb{B}}{t} \Big)
     = - \mu_0 \mu_r \varepsilon_0 \varepsilon_r \pdv[2]{\vb{B}}{t}
 \end{aligned}$$
 
@@ -79,9 +77,7 @@ taking the curl of Faraday's law yields:
 
 $$\begin{aligned}
     \nabla \cross (\nabla \cross \vb{E})
-    %= - \nabla \cross \pdv{\vb{B}}{t}
     = - \pdv{t} (\nabla \cross \vb{B})
-    %= - \pdv{t} \Big( \mu_0 \mu_r \varepsilon_0 \varepsilon_r \pdv{\vb{E}}{t} \Big)
     = - \mu_0 \mu_r \varepsilon_0 \varepsilon_r \pdv[2]{\vb{E}}{t}
 \end{aligned}$$