$\frac{3x}{x^2+x-2}$
$-1-2\sec\left(-4x\right)=1$
$\int3^{-3x}dx$
$\int x\left(x^2-6\right)^8dx$
$9a^3x^2+2ax^2-3ax$
$\left(2c-6\right)^2$
$144a^2-a^4$
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