Найдите сумму многочленов:

\(\displaystyle (13st^{\,2}u+21s^{\,3}t-7tu^{\,4}-41t^{\,5})+(12s^{\,3}t-13st^{\,2}u+7tu^{\,4}+19t^{\,4}u^{\,5})=\)

\(\displaystyle =\)[ ]