$\int\cos\left(\frac{2x}{3}\right)dx$
$4x^3+x^4$
$\lim_{y\to0}\left(\frac{y^2}{1-3\cdot\cos\left(y\right)}\right)$
$\sqrt{9x^4}-\cot\left(x\right)$
$\frac{49x^4y^6}{7x^3y^3}$
$\sqrt{5x}^2\cdot\sqrt{15x^3}$
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