$\frac{dy}{dx}-2y=e^{-x}y^2$
$sin^2x+3cos^2x$
$\lim_{x\to\infty}\left(\sqrt{\frac{8x^2-3}{2x^2+x}}\right)$
$90x^2-80-100$
$\left(x\right)-2x^2-5$
$169t^2-\:\:\:\:+36$
$16.2-87.23$
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