$\frac{d}{dx}4x^4=4y^2+6x^2$

$\frac{\cot^2\left(t\right)}{csc\left(t\right)}$

$\lim_{x\to+\infty}\left(\frac{x}{\frac{1}{\left(1-xln\left(1+\frac{1}{x}\right)\right)}}\right)$

$\int\frac{2}{t\:\left(\ln\left(t\right)\right)^2}\:dx$

$\int e^{4x}\sin4xdx$

$e=\frac{xy}{z^2}$

$8^2-13^2$