$9\left(-4+6\right)+2\left(-2+9\right)$
$\frac{\csc^2\left(x\right)}{csc^2\left(x\right)-1}$
$3-x^2+2abx^2-bab$
$\left(b^{-7}\right)^2\cdot b^6$
$\int x^33\sqrt{x^2+4}dx$
$\left(5a^2-3\right)\left(5a^3+3\right)$
$\left(x^4-12\right)\left(x^4\right)$
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