After years of studying math in area of real and complex analysis,proving calculus
via axiomatic approach my ans to the qns is.....
Qns) How to differentiate man and woman=d(man.woman)
=man.d(woman)+woman.d(man)
In simple english, it means man times differential of woman plus woman times differential of man. This is using differential to solve the problem and of course the theory of differentiation was proven using real analysis which deal with epsilons and deltas....
Of course, I made a bold assumption i.e man and woman are differentiable. Since many of u have even come out with examples that man and woman are differentiable, I conclude my assumption is reasonable.
Ok I hav enuf fun liao....FI can ban this thrend liao
