d) of theseRange of the function f(x) = 1 + 3 cos 2x is:-a) (2,4) b) – InterviewSolution

1.	d) of theseRange of the function f(x) = 1 + 3 cos 2x is:-a) (2,4) b) [-2,4]2xvi)d) of these
Answer» option b is correct since cos 3x will lie between -1 and 1

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