$7s\cdot2s^4$
$2\sqrt{x}\cdot x$
$\int\left(\frac{9}{\sqrt{x}}\right)dx$
$-a^2+9a=0$
$\left(1-\cot^2a\right)\left(1+\cot^2a\right)=1$
$3x^2-y^2=3y-5x+2x^2$
$3\cdot2\cdot3$
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