$-4x^2-4y+4$
$9\cdot\left(-5\right)^2$
$\lim_{x\to0}\left(\tan x\:-\:x\:\right)$
$\frac{dy}{cos^2y}=2\sqrt{x}dx$
$3x-3y-9x+7y$
$\left(6m-3n\right)^2$
$\int \frac { x } { ( x + 1 ) ( x ^ { 2 } + 1 ) } d x$
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