$\left(\frac{a^3}{2}-x\right)^2$

$y^3\cdot\frac{d^2y}{dx^2}-\frac{4}{25}=0$

$\int\frac{4}{8+x^2}dx$

$\frac{y^2}{4}-y^2+2^2$

$\int_0^1\left(15e^{-x}+2\right)^2dx$

$\left(x+2\right)+\left(5y\right)\cdot\left(x+2\right)-\left(5y\right)$

$\int_{-2x^4}^x\left(\frac{1}{\sqrt{t+1}}\right)dt$