$\frac{x^3-3x^2+1}{x}$
$\lim_{x\to0}\left(\sin\left(x\right)\cos\left(x\right)\right)$
$\left(2x^2-\frac{1}{2}\right)^2$
$\int sech\left(40x\right)tanh\left(40x\right)dx$
$3a+7-11-9a$
$6x^3-9nx^2y^3-3n^2x^4y^3$
$\int3.7^xdx$
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