Question

If y =cos (xy) then find dy by. Dx

Answer 1

its your answer. I hope it will help you.

Answer 2

Here we can take y as a independent variable or as a constant.

If it is constant then,

d(cos(xy)) / dx = - sin(xy) * y

If y is a independent variable then,

d(cos(xy)) / dx = -sin(xy) * (y + x dy/dx)

I hope it help you.........