$\int\left(-\frac{\sec^2x}{3}\right)dx$
$\frac{4x^2-36}{2x+6}$
$\left(2x-3y+xy\right)^2$
$\left(-3\right)+\left(-10\right)-\left(-15\right)$
$x^3+y^3=4$
$y=3x^2+27x+60;x=-6$
$\lim_{x\to1}\left(\frac{x}{x-1}-\frac{1}{x}\right)$
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