$\sin\left(2a\right)^2$
$\int\frac{2x^2+5x+6}{x^2+3x+2}dx$
$5x^2-10x>0$
$2x-1-x+5$
$\left(x+1\right)\:\frac{x}{x+1}$
$f\left(t\right)=2t\left(3-t\right)+4t$
$15f-13g+5-4f-8g+9$
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