Mathematics · Calculus
The function f(x) = [x] · cos(2x - 12 π), where [x] denotes the greatest integer function, is discontinuous at
- 1every rational number x which is not an integer
- 2all non-zero integer points✓
- 3no real number x (continuous everywhere)
- 4all irrational numbers x
Correct answer
all non-zero integer points
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