$\int_1^{\infty}\left(\frac{in\:x}{x^2}\right)dx$
$\frac{d^2}{dx^2}\frac{x+1}{x-1}$
$- ( 7 n - 24 ) ^ { 2 }$
$\lim_{x\to+\infty}\left(\frac{2x^4-3x^3-2x+6}{5x^3-4x^2+x-1}\right)$
$-12x^3+36x^2+18$
$36\left(5x^3-13x^2-36x+36\right)$
$400r^2t^2\:-\:120rct\:+\:9c^2$
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