$-3x^2-2x-5\:\:\:\:\:\:para\:x=2$
$\frac{\left|8-3\right|}{\left|15-7\right|}$
$2x-5\ge3$
$p^2+pr+ps+rs\:+\:6p^2+6ps$
$\lim_{x\to7}\left(\frac{x^2+3x-70}{x-7}\right)$
$\cot^2a$
$5.45-10.22-15.44+16$
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