$4-\left(-4-\left|-9-7-\left(-8-3\right)-4\right|+2\right)-1$
$=\frac{x^{2}-3}{x^{2}+2}$
$\frac{\left(3x^2-5x+2\right)}{\left(3x\right)}$
$-20a-50a-40a-a$
$\left(3e+\frac{3}{4}f\right)^2$
$\int2t^4dt$
$\int\sec\left(x+3\right)dx$
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