$5-2x<11$

$\left(\frac{2}{5}a^2-a^4\right)\left(\frac{2}{5}a^2+a^4\right)$

$\int_{-1}^0\left(x^2-2x+5\right)\cdot e^xdx$

$\frac{3x^2}{\cos^2\left(x^3+1\right)}$

$\left(a\:-\:4b\right)\:\left(c\:-\:d\right)$

$\frac{dy}{dx}=e^{x-y},\:y\left(0\right)=0$

$\frac{x^4-1}{x^2}$