$2cos\left(x\right)=2cos\left(2x\right)$
$x^2\:-\:12x\:+20$
$h\left(t\right)=64t-16t^2$
$\int\left(2x-1\right)\left(3x-2\right)^3dx$
$40-\left(-2\right)$
$\frac{x^4+3}{x^2}$
$4m^4+8m^2n^2+9m^4$
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