$\int\:\frac{3x^3-4x+6}{x^4+2x^3+2x^2}dx$

$\int\left(\frac{4}{\left(4x^2+9\right)}\right)dx$

$-9\cdot\left(5a+b\right)$

$\int\frac{6}{\left(x+4\right)\left(x-2\right)}dx$

$\frac{85\sin48}{\sin52^{\circ}}$

$64w^2-48w+9$

$\lim_{x\to0}\left(\frac{2^{-x}-1}{1-3^x}\right)$