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

$\frac{6x\cdot x-4}{2}$

$\lim_{x\to\infty\:}\left(\frac{3e^{3x}-3-5x}{x^2}\right)$

$\frac{64a^3-125^3}{4a-5b}$

$\left(5x^5-y^2\right)^3$

$2x-3y+z=3$

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