$10+2x-5x-12+3x+2$
$w^4-3w+5.w-1$
$4x^5-x^3+32x^2-8$
$\lim_{x\to0}\left(\frac{sec^2\left(-x+2\right)}{x^2-4\:\:}\right)$
$\frac{dy}{dx}+0.196y=9.8$
$900-58$
$\int\frac{\tan\left(x\right)}{\tan\left(x\right)+\cot\left(x\right)}dx$
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