$\left(9^{0.4}\right)\cdot\left(55^{0.6}\right)$

$\int x\sqrt{1+x^2}\cos\left(\sqrt{1+x^2}\right)dx$

$-2r-2<4$

$2\left(\frac{dy}{dx}\right)+10y=1$

$14x^4y^5\left(-13x^1y^3\right)$

$\lim_{x\to4}\left(\frac{\left|x+4\right|}{x+4}\right)$

$\frac{7}{4}\left(3x^2y-987x=y+5^3\right)$