$cos\left(x\right)=cos\left(3x\right)$
$4x^4-3x^3+26x^2-27x-90$
$\sqrt{1}^{-1}$
$\left(x^2-2\cdot x^2+2\right)+5$
$2a^2-7a-15$
$38.975+.216+1.35$
$\sqrt[4]{2401x^{15}}$
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