\left. \begin{array} { l } { ( 3 c - 5 b d ) ( 3 c + 5 b d ) } \\ { ( a ^ { 2 } + 1 ) ( a ^ { 2 } - 1 ) } \\ { ( b ^ { 3 } - c ) ( b ^ { 3 } + c ) } \\ { ( 2 a + x ^ { 2 } ) ( 2 a - x ^ { 2 } ) } \\ { ( x ^ { 3 } - 2 y ^ { 4 } ) ( x ^ { 3 } + 2 y ^ { 4 } ) } \end{array} \right.
Evaluate
9c^{2}-25\left(bd\right)^{2},\ a^{4}-1,\ b^{6}-c^{2},\ 4a^{2}-x^{4},\ x^{6}-4y^{8}
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