$a^4-a^2$

$\int_4^6\left(\left(\sqrt{x}\right)\frac{1}{2}x\:+\:2\sqrt{x}\right)dx$

$\left(-\frac{1}{5}\sin\left(\frac{x}{2\sqrt{5}}\right)\right)\cdot\left(-\frac{1}{10}\cos\left(\frac{x}{2\sqrt{5}}\right)\right)$

$-2\sqrt{3}+\sqrt{12}$

$\int sen\left(\frac{\pi\:}{3}-x\right)dx$

$88+1+0+-13+-14$

$\lim_{x\to\infty}\left(\frac{\left(x+1\right)}{\left(x-3\right)}\right)$