$2x^2-21x+50$
$\log\left(x-9\right)+\log\left(100x\right)$
$7\:sin^2\:t\:\left(1\:+\:cot^2\:t\right)$
$3^2>2^3$
$2dy=\left(x^4+x^3+x^2+x+1\right)y^{-3}dx$
$6x^3+13x^3$
$x^2y=5$
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