$\frac{5x^2-2x^2-3}{x-1}$
$\frac{\sin\left(2x\right)}{sin\:x}-\frac{\cos\left(2x\right)}{cos\:x}=\frac{1}{cos\:x}$
$-5h+2h+h$
$\lim_{x\to\infty}\left(1+\frac{9}{x}\right)^{5x}$
$\int arctan\left(5z\right)dz$
$\frac{-1}{x-12}=\frac{x}{27}$
$\frac{x}{-5}=0$
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