$\int ( 2 x + 5 ) ^ { 2 } d x$
$-9y^2+2y^2$
$\left(\frac{11}{4}ahk^4\right)\left(\frac{12}{11}a^2hk^2\right)$
$z^2-16z+256$
$z^2+z-6$
$6x^4-7x^3$
$\frac{4x-2}{2x+8}$
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