$16x^2-x^4$
$\frac{\sec\left(x\right)\csc\left(x\right)}{\cot\left(x\right)}=\sec^2x$
$\frac{3x^2y+15}{x^2-25\:}$
$3x^2-2x<6$
$\left(3a^4-5b\right)^2$
$\lim_{x\to-1}\left|x\right|$
$2^2+1+2x+x^2+x+8$
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