$\left(x^2-\frac{1}{x}\right)\cdot\left(x^2-2x+1\right)$
$14x^2y^2-28x^3$
$\frac{4x+1}{-2x-2}$
$\left(6a+1\right)\left(6a-7\right)$
$4\sec^2=3+\tan^2$
$3x^4+5x^3+10x^2+20x-8$
$\sec\left(x\right)^2+\tan\left(x\right)^2+1=\frac{2}{\cos\left(x\right)}$
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