Get link Facebook X Pinterest Email Other Apps August 07, 2021 $\frac{2}{5}\sqrt{{{a}^{2}}+{{b}^{2}}}\frac{n!}{r!\left( n-r \right)!}$ \[\frac{dy}{dx}\] M.dx + N.dy is exact iff \frac{{\partial M}}{{\partial y}} = \frac{{\partial N}}{{\partial x}} Read more