1. ## Differential equation

I need to show that this diff eq $(x+3x^3siny)dx+x^4cosy\ dy=0$ is not exact and multiply it by $\frac{1}{x}$ to make it exact..

thanks

2. Originally Posted by ashes
I need to show that this diff eq $(x+3x^3siny)dx+x^4cosy\ dy=0$ is not exact and multiply it by $\frac{1}{x}$ to make it exact..

thanks
So where are you stuck? What working can you show?

for 1st part i partial diff it wrt y to get $3x^3cosy$ and 2nd part wrt x to get $4x^3cosy$...
for 1st part i partial diff it wrt y to get $3x^3cosy$ and 2nd part wrt x to get $4x^3cosy$...