$y^2-4x^2+32x-68=0$
$-x^2+9x-20$
$\int e^{-kx}dx$
$789\:-\:\left(-13\right)$
$\left(2x-3y+2z\right)^2$
$y-yfgx=0$
$\frac{\left(sec\:a\:-\:tana\right)}{seca\:+\:tan\:a}$
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