\input amstex

$$
\frac{e^{\text{\pmb i}314 t}+e^{-\hbox{\tiny\pmb{i}}314 t}}2
-\frac{e^{\hbox{\tiny\pmb i}650t}+e^{-\hbox{\tiny\pmb i}650t}}2=1\;
&\Longleftrightarrow\;e^{\hbox{\tiny\pmb i}314t}\cdot\biggl\{1-\frac{e^{\hbox{\tiny\pmb i}336t}+e^{-\hbox{\tiny\pmb i}336t}}2\biggr\}=1
$$