$\frac{3x^4-5x^2+8}{2x^3+5x^2}$

$\int x^2\left(x^3+8\right)dx$

$x+8=3x+4$

$\left(1-\cos^2\left(x\right)\right)\left(\tan^2\left(x\right)\right)$

$\lim_{x\to\infty}\left(\left(5\cdot x^2-x\right)^{\frac{1}{x}}\right)$

$\int\frac{\left(x+2\right)}{x^2-2x+5}dx$

$\frac{1}{4}c\:-9x$