$\frac{\cos\left(a\right)-\sin\left(a\right)}{\cos\left(a\right)+\sin\left(a\right)}$

$-\left\{2-\left[-4+4\left(2+10\right)\right]\right\}$

$18x^3+12x^2-24x^2y$

$\left(\sqrt{5^8}\right)^{-1}$

$\int\left(ln\left(9x-3\right)\right)dx$

$p+5<10$

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