$\frac{d^{20}}{dx^{20}}\left(xsin2x\right)$

$2\sin\left(2x\right)=3\tan\left(x\right)$

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

$\left(n-3\right)\left(n+4\right)\:\:\:\:\:\:\:\:\:\:\:\:$

$\left(\frac{3y-1}{4x}\right)\left(\frac{dy}{dx}\right)=\frac{y^2}{x^2+9}$

$78\cdot\left(-65\right)$

$xy'-2y=x^2$