Is there a way to place a mathematical equation over a picture? I am using the overpic package and \put command, but it doesn't work (\usemath, \begin{equation}...\end{equation}).

     \cos\alpha = \frac{u \times v}{|u| \times |v|}

Any way to solve this?


you have to put the equation into a \parbox:


     \cos\alpha = \frac{u \times v}{|u| \times |v|}


enter image description here

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