Solve {l}{ac^{4}-c^{4}-25ac^{2}+25c^{2}}{4x^{2}-4xy+y^2-9}{36^n-2*6^n-25^n+1,text{ran}n}

\left. \begin{array} { l } { a c ^ { 4 } - c ^ { 4 } - 25 a c ^ { 2 } + 25 c ^ { 2 } } \\ { 4 x ^ { 2 } - 4 x y + y ^ { 2 } - 9 } \\ { 36 ^ { n } - 2 \cdot 6 ^ { n } - 25 ^ { n } + 1 , \text { ran } n } \end{array} \right.

Evaluate

\left(a-1\right)c^{2}\left(c^{2}-25\right),\ \left(2x-y\right)^{2}-9,\ 36^{n}-2\times 6^{n}-25^{n}+1,\ arn^{2}

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