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+1 vote
57.7k views
in Mathematics by (150k points)

If f : R→S, defined by f(x) = sinx - 3cosx + 1, is onto, then the interval of S is
(a) [0, 1] 

(b) [–1, 1]

(c) [0, 3] 

(d) [–1, 3].

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