$$1-25 { \left(2A-5B \right) }^{ 2 }$$
$-25\left(2A-5B\right)^{2}+1$
$$1-25\left(4A^{2}-20AB+25B^{2}\right)$$
$$1-100A^{2}+500AB-625B^{2}$$
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$1-625B^{2}+500AB-100A^{2}$
