$\cos\left(x-3\right)\left(\sqrt{2}-2\sin\left(x\right)\right)=0$
$4x^2-16xy+32x^3y$
$y^4+y^2+y=0$
$\lim_{t\to0}\left(\frac{\left(x+t\right)^4-x^4}{t}\right)$
$\sqrt[3]{x+5}=2$
$\lim_{x\to\infty}\left(x-\frac{x^2}{\sqrt{x^2-x-2}}\right)$
$\frac{2x^2+4x-3}{2}$
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