$21y^2-54y+24$
$\left(2m+5n\right)^2$
$-6m+8m-2m-mn+9mn$
$\frac{\frac{1}{\sec\left(x\right)}}{1+\sin\left(x\right)}$
$48x^2-64+2$
$\left(c+3\right)\:\left(c+3\right)$
$\left(3+3y\right)^2$
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