$\int\left(cos\left(4t\right)e^{\frac{65}{2}t}\right)dt$

$\lim_{x\to\infty}\left(\frac{5+e^{-x}}{1+e^{-x}}\right)$

$12\frac{5}{10}$

$\int\cos^7ydy$

$\frac{\left(x-1\right)\left(x-5\right)}{\left(x-3\right)\left(x+4\right)}$

$\left(81-x\right)\cdot\left(4-x\right)>x+11$

$12xy+10xy+6xy+7xy$