$10=\frac{x}{2}$
$\lim_{x\to\infty}\left(\sqrt{x^2+4x+9}-x\:\right)$
$64+124x^3$
$\int b^xdx$
$\frac{\sin^2x}{\sec^2x-1}$
$12.3ab+6ac-9ad$
$-13z+yz+9z+7y-7yz$
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