A. φ
B. R
C. [0, ∞)
D. (-∞, 0)
The domain of √(x-1)(x-2)(x-3) is
The domain of f(x)= log10(√x-4 +√6-x) is
The domain of √1-3x+Cos-1 3x-1/2 is
f={(1, 4), (2,-2), (3,10)} then f/2=