$\lim_{x\to-2.5}\frac{\tan\left(x+3\right)}{x+3}$
$\int t^2\cdot ln\left(t\right)dt$
$\frac{3+x^3-5x}{x^2+x}$
$\frac{d}{dx}\:\frac{t}{t-6}$
$\left|\sqrt{5-5}\right|$
$\lim_{t\to-1}\left(d-2at\right)$
$4^2x\:4^4$
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