$\frac{x+5}{x^2+3x+2}$
$\left(2a^2+1\right).\left(2a^2-1\right)$
$\left(2x^4\right)^{-2}$
$\left(9-a\right)y\left(9+a\right)$
$4sinx-1=2sinx$
$\cot^2\left(x\right)-3\csc\left(x\right)+3$
$a^4b-5ac$
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