$\:20x-18x^2+4x^3$
$\frac{6}{x};\:x=-2$
$\left(sin2x+cos2x\right)^2=2$
$-13xy^2\left(-6xy\right)$
$8a^2-24ab+18b^2$
$\sin2=\cos\left(60\right)$
$\frac{x}{5}-4=6$
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