$\lim_{x\to\infty}\left(\frac{x^5-4x^3}{x^6-x^2-3}\right)$
$\frac{4x^4+2x^2+x+1}{x^2+1}$
$\left(\sqrt{5}-4\right)\left(\sqrt{5}+4\right)$
$-3^2+\left(-4+7\right)\left(2\right)$
$\frac{\sqrt{x^2-8x+16}}{\left(x-4\right)\left(e^{2x}\right)}$
$\frac{\cos\left(x\right)^2}{\sin\left(x\right)\left(1+\sin\left(x\right)\right)}=\csc\left(x\right)-1$
$-10\left(6a-9\right)+8$
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