$\left(x-3x^2\right)\left(x\:+\:2x^2\:-\:4\right)$
$435\:-\:\left(-200\right)$
$2x^2+y^2-7=0$
$\left(-1\right)^{n+1}\cdot\frac{1}{3^n-1}$
$27b^3+64$
$\int\left(-\csc\left(2x+9\right)\right)dx$
$8x^2y+32xy^2+4xy$
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