$\frac{\pi}{2}+\frac{8\pi}{2}$
$\frac{d}{dx}\:\:2arctan\:\left(\frac{2}{w^2}\right)$
$36x^6+36x^5+9^4$
$\left(25z-4y\right)\left(25z+4y\right)$
$50\cdot24$
$\lim_{x\to-\infty}\left(x^9\:e^{-x^8}\right)$
$\int\:\frac{x^4+1}{x^4-1}dx$
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