$\frac{1}{4}+\frac{1}{10}+\frac{1}{28}+\frac{1}{3^n+1}$
$ydx-4\left(x+y\right)dy=0$
$\:\left(x+y-7\right)^2$
$\lim_{x\to0}\left(\frac{\left(x\right)}{\left(\tan\left(x\right)^{-1}\right)}\right)$
$x^4-x^3-10x^2+4x+24$
$-5x-4x+7+2x-8$
$-\frac{-8}{-4}$
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