$\frac{y^2-3xy}{x^2}+2$
$\left(7f\:-\:5r\right)^2\:\:\:\:\:\:\:\:$
$-\:20-\left\{\:-4\:-\:\left[-8\:+\:\left(+12\:-6\:-2\right)\:+2\:+3\right]\right\}$
$\frac{d}{dx}\frac{-4}{\sqrt[3]{x}}$
$1+\frac{2b}{3}+\frac{25x^4}{36}$
$5\:cos^2\:x\:=\:4\:-\:sen^2\:x$
$3e+5e+e$
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