Find 
in each of the following:
tan – 1 (x2 + y2) = a
We are given with an equation tan – 1(x2 + y2) = a, we have to find 
of it, so by differentiating the equation on both sides with respect to x, we get,
9
Find in each of the following:
tan – 1 (x2 + y2) = a
We are given with an equation tan – 1(x2 + y2) = a, we have to find of it, so by differentiating the equation on both sides with respect to x, we get,