$\frac{d}{dx}\left(\ln\left(\sqrt{x^2+y^2}\right)+xy=4\right)$

$\log\left(4x\right)=2$

$\int\left(e^{4x-5}\right)dx$

$\left(\frac{x}{4}-\frac{y}{8}\right)^2$

$\int_0^{\frac{\pi}{2}}\left(tan\:2x\right)dx$

$\left(\frac{16}{25}j-\frac{7}{8}a\right)^2$

$\int x^3\sqrt{5x+2}dx$