$\left(3x^4+5\right)^2$
$\lim_{x\to-\infty}\left(\frac{2x}{\sqrt{x^2-4}}\right)$
$\lim_{x\to0,999}\left(\frac{x-2}{x^2+x-6}\right)$
$4y^2-12y-9$
$\frac{2}{1-\cos\left(x\right)}+\frac{2}{\sec\left(x\right)-1}$
$\int8xsenxdx$
$\frac{2x}{7}\cdot\:\frac{x^2}{2^2}$
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