$\int\left(\frac{\sec\left(x\right)^2}{\tan\left(x\right)^2+13\cdot\tan\left(x\right)+42}\right)dx$

$\left(5x^2+4y\right)\left(5x^2-4y\right)$

$\left(j+k\right)^2-\left(j-2k\right)^2-\left(j-k\right)^2$

$\frac{d}{dx}-\frac{4}{x}-\sqrt{x^3}$

$\int_0^{\infty}e^{-abm^2-bm}dx$

$\sqrt{2^{9^{4^{-2^{-1}}}}}$

$\frac{3u^{3}v^{4}-2v^{5}v^{2}+\left(u^{2}v^{2}\right)^{2}}{v^{3}v^{2}}$