$\lim_{x\to7}\left(\left(x-7\right)^2\cdot\frac{e^{2x}}{x^3-9x^2+15x-7}\right)$

$4m\:-+\:12m\:-15$

$\int\frac{x^3}{\sqrt{a^2-x^2}}dx$

$\left(3m\right)\left(5+4m^2-10m^4\right)$

$\frac{21^6.35^3.80^3}{15^4.14^9.30^2}$

$y\frac{dy}{dx}=e^{\left(2x-y\right)}$

$-3\left|5-2^3\right|+3\:times-1.5$