$\frac{6cos^2x}{cosx}$
$y+18=19$
$3a\:\:\:\:-\:\:2b\:\:\:\:-\:\:5a\:\:\:\:+\:\:4b\:\:\:\:-\:\:6a\:\:\:\:+\:\:3b$
$\left(n+1\right)\left(n+3\right)+\left(n+2\right)\left(n-2\right)-2n^2-7-5n$
$\int\frac{e^{2t}}{\sqrt{e^t+1}}\:dx$
$x^3-2x^2$
$\frac{dy}{dx}=\left(x+1\right)\frac{1}{2y}$
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