$\left(8x+1\right)\left(a+b\right)$

$\int e^{\left(2x\right)}\left(-cos\left(x\right)\right)dx$

$\frac{4x^3+16x^2+6x+12}{4x^2+6}$

$\lim_{x\to0}\left(x-ln\left(x^2+1\right)\right)$

$13x^2y^2\left(-7^5y^2\right)$

$\lim_{x\to\infty}\left(\frac{log\left(x\right)}{x^n}\right)$

$\int e^{-.05t}dt$