$18+8n=74$
$\int\sqrt{x}lxdx$
$\frac{az}{ay}\left(3x^2z-x^2y^2+2z^3+3yz-5=0\right)$
$\frac{\cos\left(10^{\circ}\right)}{cos20^{\circ}}+\frac{sen40^{\circ}}{sen70^{\circ}}$
$20y^9+50y^5$
$10n^2+21n+2$
$\left(11-15x-7x^2\right)\left(25-16x^2\right)$
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