Let \( f:[-1,2]\to \mathbb{R} \) be given \( f(x)=2x^{2}+x+[x^{2}]-[x] \) where \( [t] \) denotes the greatest integer less than or equal to \( t \). The number of points, where \( f \) is not continuous is:
\( 5 \)
\( 6 \)
\( 3 \)
\( 4 \)