$\lim_{x\to\infty}\left(\frac{x^4}{e^{3x}}\right)$
$\frac{1}{2sin^2x-1}$
$\frac{1}{2}\left(\frac{4x-4}{y}\right)$
$\frac{2x+5}{-4x+8}$
$2\cos\left(x\right)^2+\sin\left(y\right)-1=0$
$\frac{d}{dx}7x^2-2$
$x^2\cdot\left(x^2-2x+1\right)$
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