$2^1\cdot2^5$

$\int\left(\frac{x^2+5}{x^2-7x+12}\right)dx$

$\int\left(\left(\frac{e}{kt}\right)^{\frac{1}{2}}\cdot e^{\left(\frac{-e}{kt}\right)}\cdot\frac{1}{kt}\right)de$

$\int\frac{x^2}{x^2+3x+2}dx$

$x^7-2x^{6\:}+\:x^5$

$\left(\frac{2}{3}+\frac{a}{5}\right)\left(\frac{2}{3}-\frac{a}{5}\right)$

$x-5-x-3$