$49x^2-182x+169$
$\left(-1\right)^2\:x\:\left(-1\right)^3\:x\:x\:\left(-1\right)^6$
$cot\:a\:sen\:a\:+\:cos\:a\:=2\:cos\:a$
$\frac{3x^2-1}{x^3-3}$
$\frac{x^2-9y^2}{3x+9y}$
$\frac{d}{dx}\ln3x+7$
$\frac{18}{0.37}$
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