Please help me out!!!

this is the question: Find the value for k so that the given DE is exact

(6x (y^3) + cos y )dx + (2k (x^2) (y^2) - x sin y)dy =0

thank you so much

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- June 11th 2008, 08:09 AMkithyfinding a value to make a DE exact
Please help me out!!!

this is the question: Find the value for k so that the given DE is exact

(6x (y^3) + cos y )dx + (2k (x^2) (y^2) - x sin y)dy =0

thank you so much - June 11th 2008, 08:17 AMChris L T521
- June 11th 2008, 08:56 AMkithy
Ok, i equated the two equations and i came out with K= (18xy^2)/(4xy^2) and so i am assuming the xy^2 cancel out and we are left with k=9/2 is that right?

- June 11th 2008, 06:03 PMChris L T521
- June 11th 2008, 07:55 PMkithy
Yes it really does, thank you so much, i understand it better now (Rofl)