$\frac{csc\left(-t\right)-sin\left(-t\right)}{sin\left(-t\right)}=cot^2\left(t\right)$

$\int\left(\sqrt{2+2cosx}\right)dx$

$\lim_{x\to\infty}\left(3-\frac{2}{x^2}\right)$

$\frac{x-1}{3x}-\frac{x+3}{x^{2}}$

$-\left(x+y\right)^2$

$\sqrt{\left[\left(4.1-4.8\right)^2+\left(2.2-2.9\right)^2\right]}$

$\int ln\:lnxdx$