$8a^3+5t+5a^3+4t-7a^2$
$4x^2-12x+198$
$1+\frac{\left(x-2\right)^{n-1}}{\left(n-1\right)^2}$
$5a-17^2+2a+4$
$\int\left(\cot^4\left(2x\right)\right)dx$
$\lim_{x\to-\infty}\left(1-\frac{2x}{x^2-1}\right)-4x$
$19x-\left(13x-x\right)$
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