\begin{array}{l} λ_{x} = \frac{2 L}{n_{x}} = \frac{h}{m v_{x}}, n_{x} = 1, 2, 3 . . . \\ λ_{y} = \frac{2 L}{n_{y}} = \frac{h}{m v_{y}}, n_{y} = 1, 2, 3 . . . \\ λ_{z} = \frac{2 L}{n_{z}} = \frac{h}{m v_{z}}, n_{z} = 1, 2, 3 . . . \end{array}

${\begin{array}{l} \lambda_x= \frac {2L} {n_x}= \frac {h} {mv_x}, n_x =1,2,3 ... \\ \lambda_y= \frac {2L} {n_y}= \frac {h} {mv_y}, n_y =1,2,3 ...\\ \lambda_z= \frac {2L} {n_z}= \frac {h} {mv_z}, n_z =1,2,3 ... \end{array} }$

Error