18. If If }(x) = Sgn(2 sinx+a) is contin...

18. If If }(x) = Sgn(2 sinx+a) is continuous for all x then the possible values of'a' are 1) R 2) a<-2 or a > 2 3) (-2, 2)4) (0, 0) Continuity of composite .

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