$+\frac{2}{3}x+\frac{5}{6}x-\frac{7}{12}x$
$\frac{dy}{dx}cx+c^2+1$
$\left(x-3\right)\left(x+4\right)-x^2-x+19$
$x^2-5x+54$
$49\cdot51$
$\left(t^2\right)^2$
$\frac{1+sec}{1+cos}$
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