$\lim_{x\to\frac{\pi}{2}}\left(2cot\left(2x\right)\right)$
$y^2=4cx$
$25m^2-40xy^2+16^4$
$\left(16x^2-6x^3+5x\right)+\left(-4+16x^2-31x^3\right)$
$6b^2x^2-3x^2+4b^2-2$
$s^3+8s^2+19s+12$
$-15y^3z-27y$
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