$\lim_{n\to+\infty}\left(1-e^{-nx}\right)$
$-4x+8=x\:+8$
$\int\frac{4}{x\left(x-1\right)\left(x+2\right)}dx$
$3-3cosx-sin^2x$
$12-\frac{1}{3}u=2$
$\sec^2x-2\tan x$
$\frac{1-\cos\left(t\right)}{\sin\left(t\right)}+\frac{\sin\left(t\right)}{t-\cos\left(t\right)}$
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