$x^2-\left(x^3-1\right)^2$
$\lim_{x\to0}\left(\frac{e^{4t}-1}{sin\left(2t\right)}\right)$
$\frac{\csc^2\left(x\right)}{csc^2\left(x\right)-1}=sec^2\left(x\right)$
$3\left(6x^2+4\right)^3$
$\frac{x^2-20x+x}{x+5}$
$2x^2+4x=30$
$\left(2x-6y\right)^2$
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