$a^2-20a$
$\int2xcos\left(x^2-1\right)dx$
$\lim_{n\to\infty}\sqrt{x^2+8-x}$
$x^2\left(y-2\right)-y\left(y-2\right)$
$\left(17\right)+8+\left(-12\right)-\left|\left(-16\right)-\left(-4\right)\right|$
$12a^2bx-15a^2by$
$x^4-20x^2+64$
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