$\frac{n^2}{3^n}x^n$

$13=v-7$

$\int\frac{2x+1}{\left(x+1\right)^3}dx$

$6-\left(-6\right)-6-\left(-6\right)$

$\frac{dy}{dx}\left(y=\left(e^{-2x}\right)\sqrt[3]{x^2-1}\sqrt{1+\sqrt{x}}\right)$

$\int\frac{\cos\left(x\right)}{\sqrt[3]{1+\sin\left(x\right)}}dx$

$\left(\sqrt[3]{a^{x-1}}\right)\left(\sqrt{\sqrt{a^{x-2}}}\right)$