$\frac{x^{2}}{4-x^{2}}$
$\lim_{x\to0}\left(\frac{\left(\sin\:^2\left(2x\right).\cos\:\left(2x\right)\right)}{\left(\ln\left(e^x+2\right)-ln\left(3\right)\right)}\right)$
$p^2-5p-50$
$x^4-m^8x^9$
$7c^2d^4+14d^5e^3-21e^2f^3+28f^4g^2$
$24a^2-96a+16$
$25a^4-4b^2$
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