$\lim_{x\to2}r\left(x\right)$

$\left(1+senx-cosx\right)^2$

$\frac{2g^2h^{10}}{5g^3h^5}$

$\int\frac{1}{x\sqrt{25x^2-36}}dx$

$3\cot\left(x\right)^2-2\cot\left(x\right)-1=0$

$\int\frac{3e^{\left(4+ln2x\right)}}{x}dx$

$\log\left(4x\right)+\left(\frac{5}{\log\left(x\right)}\right)-9$