$7xy4\:+\:2xy4\:-\:6xy4$
$-\frac{\left(x-14\right)}{\left(x+6\right)}$
$5x+9\le12$
$\lim_{x\to\infty}\left(\frac{3x^3+5x^2+9}{2x^2+7}\right)$
$25b^2d^2-10bd^2+1$
$16x^4-8x^2y^2+y^4$
$2\csc^2$
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