$a^4-10a^2+25$
$\int\frac{2s^2}{\left(s^4-1\right)}dx$
$\left|15-\left(10-3-8\right)-\left(-12\right)\right|+\left|-8+15-\left(-10-5\right)\right|$
$\frac{2x}{y^{-1}}$
$3-9+4-8-2+13$
$\int\frac{\left(\arctan\left(8x\right)\right)^2}{64x^2+1}dx$
$100+50a+a^2$
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