$\frac{dy}{e^{8y}+9e^{8y}}=\frac{1}{\left(10ye^x\right)}dx$

$\int_x^{x+2}\left(4t+1\right)dx$

$\lim\:_{x\to\:0}\frac{\left(4x^2+2x+1\right)}{\sin\left(x\right)}$

$\int\frac{11}{\left(x-4\right)\left(x+7\right)}dx$

$m-n+y;m=-2\:;\:n=7y=4$

$\frac{3x^3-20x^2+37x-20}{x-4}$

$\frac{c^{-6}b^{10}}{b^9c^{-11}}$