$\left(1-t\right)^2+t\left(1-t\right)+t^2$
$2ydx=3xdy\:when\:x=2.\:y=1$
$\left(\frac{x^2-1}{x^2+x-2}\right)\left(\frac{x^2+x+2}{x^2+2x+1}\right)$
$-4\sin\left(a\right)^2+3=0$
$\left(\frac{x^2-x}{x+10}\right)$
$13b-_{-18b}-15b=_{-16}$
$z^2-24z+49$
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