M_S = \frac{{{{F_S } \mathord{\left/ {\vphantom {{F_S } A}} \right. \kern-\nulldelimiterspace} A}}}{{{{\Delta x} \mathord{\left/ {\vphantom {{\Delta x} L}} \right. \kern-\nulldelimiterspace} L}}} = \frac{{{{F_S } \mathord{\left/ {\vphantom {{F_S } A}} \right. \kern-\nulldelimiterspace} A}}}{{{\rm{tan}}\theta }} = \frac{{{\rm{Shear Stress}}}}{{{\rm{Shear Strain}}}}
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