$\int\frac{\left(5x\right)}{\left(x^2+2x+1\right)}dx$

$\frac{dy}{dx}=x^4-3x^2+x-4$

$6x^2-96$

$\lim_{x\to0}\left(\frac{1-\cos\left(3x\right)}{2x}\right)$

$\left(2\sqrt{x}+5\sqrt{y}\right)\left(2\sqrt{x}-5\sqrt{y}\right)$

$3xy\cdot15xy$

$\int\frac{7x+7}{x^2+2x}dx$