Limits Continuity And Differentiability

Let ,\(f:[-1,2] \rightarrow \mathbf{R}\) be given by \(f(x)=2 x^2+x+\left[x^2\right]-[x]\), where \([t]\) denotes the greatest integer less than or equal to \(t\). The number of points, where \(f\) is not continuous, is :