$4.8x^2-12x+5$
$\left(2x^2y^2-8y\right)\left(2x^2y^2-87\right)$
$\left(2a+b\right)\left(2a-b\right)-\left(2a+b\right)^2$
$\left(4y-5\right)\left(4y+5\right)$
$225m^2+60m\:+\:4$
$3^a+2b+5^a+4b$
$\left(sinx-cscx\right)^3$
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