$\frac{d}{dq}\left(q^2-6q+20+\left(\frac{50}{q}\right)\right)$

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

$\int-x\cdot\cos\left(nx\right)dx$

$a^4-4a^2b^2+\frac{b}{4}^4$

$\ln\left(6-x\right)+\ln\left(x+3\right)=\ln\left(18\right)$

$4m^3-14m^2+14m-49$

$x^2+\frac{\left(-144\right)}{x^2}$