$\int x^3\cdot\sqrt[4]{1+6x^4}dx$

$a=x-7x$

$4<2x-3$

$\left(z+0.63\right)\left(z-\sqrt{y}\right)$

$\lim_{x\to\infty}\left(10x\left(ln\left(x+9\right)-ln\left(x\right)\right)\right)$

$2x\frac{dy}{dx}-\left(\frac{dy}{dx}\right)^2y-y=0$

$5x^3-3x^3$