$a^2-6a^2+12a-8$
$\frac{9x^2+5}{3x}$
$xy\:=\:1\:+\:x^2$
$x^2-2x^2-2$
$7^{-4}\cdot7^{16}\cdot7^{-4}$
$\int e^{4x}\left(6+e^{4x}\right)^5dx$
$\int\cot\left(1+2x\right)dx$
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