$x^2-4x+1,5$
$7n+3n^2$
$\lim_{t\to infinity}\left(\frac{-1}{ln\left(t\right)}\right)$
$\left(\frac{80}{2}\right)^2$
$\int_0^4\left(-x^2-\frac{19}{4}x\right)\left(\frac{-3x}{4}\right)dx$
$x^2y'\:+\:x\left(x+2\right)x=e^x$
$12x-13=-x^2$
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