$\frac{\csc\left(x\right)}{\csc\left(x\right)-2\sin\left(x\right)}=\sec\left(2x\right)$
$\frac{dy}{dx}=-\frac{2x}{e^{2y}}$
$\lim_{x\to0}\frac{ln\left(\tan\left(x\right)^2\right)}{lnx}$
$\sqrt{25x}$
$3x^2-12x=12x$
$\lim_{x\to\infty}\left(\frac{e^x}{\left(x+1\right)^4}\right)$
$2x+1x$
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