$1-\frac{x^2}{2}$
$x^2-28x+115$
$4a^4+12a^2b^2+9b^4$
$2879-579+753+978-897$
$x-2\cdot x+2\cdot x-7$
$-7>13-4x$
$sec^2x\:dy\:=\:-csc\:y\:dx$
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