$2y\frac{dy}{dx}=3x^2$

$\sqrt{3}cos\left(x\right)-sin\left(x\right)=1$

$\lim_{x\to+\infty}\left(\sqrt[3]{\frac{3x^7-4x^5}{2x^7+1}}\right)$

$\int\frac{\left(2x+1\right)}{x^2+4x-21}dx$

$\int\left(x^3\left(x^4-1\right)^5\right)dx$

$\left(8x^4-x+3\right)\left(-x^5+6\right)$

$3+4x=9x+13$