$\int\frac{1}{81}\left(\frac{1}{\cos^5\left(x\right)}-\frac{1}{\cos^3\left(x\right)}\right)dx$

$3.7321+4.7321$

$2\cdot3^3+10$

$\int\frac{2x^{3}-11x^{2}+2x-16}{\left(x^{2}-4\right)\left(x^{2}+1\right)}dx$

$34ab+18ab+2ab$

$100-8+-5+1$

$\left(3^4\cdot4^{-3}\right)^{-2}$