$3^4\cdot3^{-1}$

$\frac{2x}{x^4+8x^2+16}$

$\:+-\:3+\:20-\:74-\:6\:\:\:\:\:+\:2\:\:\:\:\:$

$\frac{\cos\left(2a\right)}{\sec\left(a\right)}-\frac{\sin\left(2a\right)}{\csc\left(a\right)}=\cos\left(3a\right)$

$32\cdot\frac{21}{16}$

$\int\frac{x^2+6x-4}{\left(x+2\right)^2\left(x-4\right)}dx$

$2a^4-6a^2+10n^3$