Question

I want to know how to differentiate a modulus function.

Answer 1

1) You don't
2) You break it up into parts and find the derivative only where it exists.

y = |x|

y = x for x > 0, and y' = 1
y = -x for x < 0, and y' = -1
Derivative does not exist for x = 0

Answer 2

I want to know can we find maxima of this