$4a^2+12ab$
$10ab-7ab-3ab-10ab$
$\frac{\sin\theta+\cos\theta}{\sec\theta+\cos ec\theta}=\frac{1}{2}\sin2\theta$
$\int\left(\frac{4x}{8x^2+9}\right)dx$
$-\frac{3}{5}x=9$
$\frac{1}{7}\sqrt{49x^3x^7}$
$-633x-844y$
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