$\left(x^{2}+5x-4\right)\left(2x^{3}+3x-1$
$\frac{\sin\left(b\right)}{\cos\left(b\right)}+\frac{\cos\left(b\right)}{1-\sin\left(b\right)}$
$\frac{1}{\cos\left(x\right)}\cos\left(x\right)$
$-4x-y+5-2x-6$
$\int21xdx$
$\left(4+3x\right)\le9$
$\left(m^2n+n^3\right)^2$
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