$a-8+1+3a$
$2x^2-13x+21=0$
$\int\frac{3}{x\left(x-5\right)}dx$
$\int\tan\left(x\right)^4\sec\left(x\right)dx$
$x^2-x+2>0$
$\lim_{t\to-\infty}\frac{t^2}{7-t^2}$
$\int125x^2\cdot sin\left(5x\right)dx$
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