$\lim_{x\to-\infty}\frac{3x+1}{x-\sqrt{4x^2-5}}$
$2x^3-18x^3+54x^2-54x$
$\left(3a+\frac{5}{2}b\right)^2$
$\:-1\left(k-9\right)$
$\frac{10m-2m^2}{2m^2-7m-15}$
$\int e^x\left(1-2\sin^2\left(e^x\right)\right)dx$
$2\frac{dy}{dt}=-5x$
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