$a2\:-\:ab$

$\int\frac{5x}{x^2+10x+25}dx$

$\left(3x-2b\right)^2$

$\int\frac{1}{\left(2\left(\sqrt[2]{x}-1\right)\right)}dx$

$g\left(x\right)=\left(\frac{1}{x^2-x}\right)$

$\lim_{x\to1}\left(\frac{2sin\left(\pi x\right)-2}{x-2}\right)$

$\frac{\sin\left(a\right)}{\sin\left(a\right)-\cos\left(a\right)}-\frac{1}{1-\cot\left(a\right)}$