\(\eqalign{& {{{{\left( {x - 13} \right)}^2}} \over {2{x^5}}}.\left( { - {{3{x^2}} \over {x - 13}}} \right) \cr & = {{{{\left( {x - 13} \right)}^2}.\left( { - 3{x^2}} \right)} \over {2{x^5}(x - 13)}} = {{ - 3\left( {x - 13} \right)} \over {2{x^3}}} \cr} \)
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