Question

If ycosx=xcosy find dy/dx when x=0 and y=0

Answer 1

product rule

Answer 2

\[-ysin(x) + \frac{dy}{dx}\cos(x) =- x \sin(y) \frac{dy}{dx}+\cos(y)\]

Answer 3

etc

Answer 4

i can't understand..sorry

Answer 5

To finish off where elecengineer, plug 0 in for x and y. Then solve for dy/dx.