$\frac{x^6+4x^4-5x^2-20}{x^2+4}$

$4cos^2x+cosx-5$

$\frac{1}{2}\left(4+5\cdot2^3-2\right)+\left(-2\right)^3$

$-116\left(m+n\right)^2y^4+100\left(m+n\right)^4+25y^8$

$\int_0^{\infty}\left(\frac{5}{x\left(5\:ln\:x\right)^2}\right)dx$

$2x^2\left(3x^2-1\right)^2$

$3\left(2x+3\right)<7x-2\left(x-8\right)$