$x^2-70x+300$
$\frac{dy}{dx}=\frac{5x^2}{4y}1,4i$
$\frac{\sin\left(2x\right)}{1-\cos\left(2x\right)}=\frac{\cos\left(x\right)}{\sin\left(x\right)}$
$2y-y+7-1+3+7x^2-4y$
$8-6n+n-7$
$x^2+x\frac{1}{2}$
$\lim_{x\to\infty}\left(\frac{3x^2-5x+18}{x^2+4x+6}\right)$
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