$5y\left(4-6y\right)$
$\frac{\text{ctg}\infty}{\cos\infty}=\csc\infty$
$3q^2-9=2q$
$\frac{6x^5y^4}{4y^3x^6}$
$36x^2-18xy^4+4y^8$
$25x^2-300x+900$
$\lim_{x\to1}\left(\frac{ln\left(x^4\right)}{x^4-1}\right)$
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