$b^2-5b+4$
$\frac{x^2+15-5}{-x+3}$
$tan\left(x-\frac{3\pi}{4}\right)=\frac{tanx+1}{1-tanx}$
$n+5n-24$
$\left(\frac{1}{x}+\frac{3}{2}\right)^{2}$
$\left(2x+3\right)\left(x^{2}+3x\right)^{2}$
$\left(y+z\right)\left(x-a+b\right)$
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