$\lim_{x\to\infty}\left(\frac{x^2+x+1}{x+2}\right)$
$\frac{cos\:t\:}{1\:-\:sin\:t}=\frac{1\:+\:sin\:t}{cos\:t}$
$\left(m-10\right)\left(m+7\right)$
$6y\:\left(2x\:-\:5\right)\:$
$cos^2\theta\:-sin^2\theta\:=2cos^2\theta\:-1$
$x3=343$
$5\frac{dy}{dx}+20y=4x$
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