$$\left. \begin{array} { l } { 2 \sin ( 2 n - 30 ) ^ { 4 } - 40 n ( - 2 n + 120 ) ^ { 2 } } \end{array} \right.$$
$2\left(\left(\sin(2\left(n-15\right))\right)^{4}-80n\left(n-60\right)^{2}\right)$
