$\int\arctan\left(\frac{u^2+1}{2u}\right)du$
$\left(\frac{4x^4}{3}\right)^2$
$\frac{1}{2a-a^2}+\frac{a}{a^2-4}$
$\int4^{x+1}dx$
$\lim_{x\to\frac{\pi}{2}}\left(\left(\pi-2x\right)secx\right)$
$3x+\frac{x+1}{2}=4\left(x+2\right)$
$-5x^2-25x-20$
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