$x2+5x+3$
$\frac{2x^2.}{x^2+9}$
$2\cdot256$
$2cos3x=1$
$-2x^5+7x^4+6x^3-6x^2-9x+4$
$45ab+30bc-60bd$
$\log\left(x^2-1\right)-\log\left(x+1\right)=3$
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