Mathematics

Mathematics

Problem

Domain of f(x)=cos⁡−1x+cot⁡−1x+csc⁡−1xf(x) = \cos^{-1}x + \cot^{-1}x + \csc^{-1}x is: (a) [−1,1][-1, 1] (b) RR (c) (−∞,−1]∪[1,∞)(-\infty, -1] \cup [1, \infty) (d) {−1,1}\{-1, 1\}

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