$28c+24$

$\lim_{x\to0}\left(\frac{\log\left(1+x\right)}{x}\right)$

$\frac{x^6}{4}-\frac{2x^3y^2}{5}+\frac{4y^4}{25}$

$\left(1-\cos^2x\right)\left(\cot\left(x\right)\right)=\sin\left(x\right)\cos\left(x\right)$

$\int\frac{x^2}{\left(x-1\right)\left(x+2\right)}dx$

$3a^2+2ab$

$a^3-9$