$\cos\left(u\right)\sec\left(u\right)-\sin^2\left(u\right)=\cos\left(u\right)$

$\sqrt[5m]{2}\cdot\sqrt[4m]{2}$

$\lim_{x\to\infty}\left(\ln\left(x+3\right)-\ln\left(x\right)\right)$

$\sec^4\left(x\right)\left(1+\tan^2\left(x\right)\right)$

$k\left(r\right)=\left(r^2+4\right)^3\left(3r-3\right)^{-5}$

$\frac{4x^3-5x^2-11x+35}{x-2}$

$2-3\cdot5+9-2\cdot4$