$4\cdot2^2$
$-5+-4+-1+8+-2+-7$
$\left(x+1+x^2\right)\left(x-1+x^2\right)=35$
$\left(x+2\right)^2=4x+20$
$\frac{x^2}{x^5}$
$9\cos^2x-1=0$
$\int\frac{6}{7+6x}dx$
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