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{latex}
\large
$$
L_{lamella}  = {{n_{cellsperSheet}  \cdot thickness_{sheet}  \cdot W_{sed}  + 2 \cdot thickness_{sheet} \left( {L_{sed}  - L_{lamella} \cos (\alpha )} \right) \cdot n_{sheets}  + L_{sed \cdot } W_{sed}  - {{Q_{sed} } \over {V_{up} }}} \over {\cos (\alpha ) \cdot W_{sed} }}
$$
{latex}