$\frac{dx}{da}=2x-x^2$
$-4x^2-12x-9$
$\left(x+\frac{1}{2}y\right)^2$
$\lim_{x\to\infty}\frac{\left(3x-2\right)^2\left(2x+5\right)^4}{\left(6x^6-7x^3+8\right)}$
$-21=-7w$
$\frac{-7}{10y^2}-\frac{5}{6y^3}$
$\left(2x-5\right)\left(2x+3\right)-\left(2x-1\right)\left(2x+1\right)$
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