$7x^2-44x+\:35$
$\left(x^2+9x^4\right)^3$
$\frac{sinx}{tanx-secx}-\frac{sinx}{tanx+secx}$
$\left(5y-1\right)^2$
$\int\frac{x}{1-3x}dx$
$9\cos^2x+18\cos x+9=0$
$u^2+42u=0$
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