1.
The number of points, at which the function f(x)=∣2x+1∣−3∣x+2∣+∣x2+x−2∣f(x) = |2x + 1| - 3|x + 2| + |x^2 + x - 2|, x∈Rx \in \mathbb{R} is not differentiable, is: