$\lim_{x\to0}\left(\frac{\frac{cos}{x}-\frac{sin\left(x\right)}{x^2}}{cos\left(x\right)}\right)$

$x2-3x^3$

$-x^2+10x-25$

$\int\sin^4\left(5x\right)\cos^3\left(5x\right)dx$

$\lim_{x\to4}\left(\frac{x^2-2x-8}{x^2-2x-24}\right)$

$\left|\left(-5\right)-\left(-3\right)\right|-\left|-\left(-4\right)-\left(-7\right)\right|$

$\left(2-e^{6x}\right)^2$