$\frac{dy}{dx}=\frac{\left(x+2\right)^2}{x^5}$
$\sec x\cdot\csc x=\frac{1}{\sin x\cdot\cos x}$
$\frac{x^4+1x^2-4}{x^2+x+1}$
$\left((a-b+c)^{(2a-3d)}\right)^f$
$3a^2\cdot a-2$
$\left(9x^7-4\right)^2$
$\lim_{n\to\infty}\left(\frac{n^3}{2^n}\right)$
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