Given the vector a = (E, 2), B = (- 3, 5), and the angle between a and B is obtuse, what is the value range of E,
The vector a = (E, 2), B = (- 3, 5), and the angle between a and B is obtuse,
e×-3+2×5<0
-3e10/3
The vector a = (E, 2), B = (- 3, 5), and the angle between a and B is obtuse,
e×-3+2×5<0
-3e10/3