$\left(r^6+qz\right)^2$
$16z+36$
$\left(2^x\right)^2-10\left(2^x\right)+1$
$2x-6y-4y+5y-5y^2+8y^2$
$\left[\left(x+y\right)-12\right]^2$
$x^2+18x-4$
$2c^2-d;\:c=4;\:d=5$
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