$\int ye^{-2y}dy$

$\sin\left(a\right)\left(3-4\sin^2\left(a\right)\right)$

$1^2+1^2-2\:x\:1\:$

$100x^2+20x+1$

$\lim_{x\to5}\left(\frac{x-5}{\left(\sqrt[2]{44+x}\right)-7}\right)$

$\lim_{x\to\infty}\left(\frac{\sqrt{x}}{\sqrt{3x^2-1}}\right)$

$2xydx+\left(y^2+x^2\right)dy$