$7+9\left(\left(-8\right)\right)$
$\left(x^4-12y\right)\left(x^4-6y\right)$
$\frac{4}{x+2}+\frac{3}{x-2}$
$9\:cos^2\:\left(x\right)+81$
$\frac{2x^3}{2x^2-4x+3}$
$sinx+\left(\frac{cos^2x}{sinx}\right)$
$\int_3^7\left(-2x\right)dx$
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