$\tan\left(x\right)+\frac{1}{\tan\left(x\right)}=\csc\left(x\right)\sec\left(x\right)$

$\sqrt{72^2}$

$-4x^2\cdot25x$

$\int5x^2e^{x^3}dx$

$\lim_{x\to\infty}\left(\frac{9x^4+9x^2}{3x^4+10}\right)$

$25a^4+54a^2b^2+49b^4+16a^2b^2$

$\left(1-\cos\left(x\right)^2\right)^2$