$\left(3x^5\right)\left(-8x^2\right)\left(x^3\right)$
$-x^2-6x+7$
$x^{12}y^3+a^6$
$\frac{\left(2x^3-4x^2+x-2\right)}{\left(4x^2-2x\right)}$
$\lim_{x\to0}\left(\frac{1}{x}-cot.\left(x\right)\right)$
$\cos\left(x\right)\cot\left(x\right)+.1\cot\left(x\right)=0$
$cos^2\left(x\right)=cot\left(x\right)cos\left(x\right)$
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