$43x^2-12x+9$
$2\left(2x+2y\right)-4x$
$\left(4x+5b\right)^3$
$16e^4-24e+9$
$9x^2-9x-10$
$-\frac{16}{5}-21+0-\frac{114}{5}$
$-\cot\left(-x\right)=\cot\left(x\right)$
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