$\left(x^2+3x^{-2}\right)\left(x^2+3x^3\right)$
$12x^2+5x-2$
$\left(3k\right)^5\left(3k\right)^4$
$4b-7-8b$
$\int\left(xe^{4x^2-1}\right)dx$
$\int\frac{\left(-4x\right)}{\left(1-2x^2\right)^{-2}}dx$
$2x+\left(f+x\right)$
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