$2ab+7ab-2ab+2$

$\int_1^t\left(\frac{1}{x^2}\right)dx$

$4xe3\:ye2\:+\:6xe2\:ye3$

$\frac{1}{1-\cos\left(y\right)}+\frac{1}{1+\cos\left(y\right)}$

$\int\left(9x^5-x^4+6x^2-7x+11\right)dx$

$2^2-12z+36$

$\frac{\left(\left(-3\right)^{n+1}\right)}{\left(5\cdot4^n\right)}$