$\frac{x^2-15x+25}{x-5}$
$8-7s-s^2$
$-12x=-72$
$\int\frac{sen^3\:4x}{\cos^2\:4x}dx$
$-2\cdot\:4$
$4x+40+100$
$\sqrt{10^2-8^2}$
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