given the function g(x) = 4sin(x) - cos(2x), which of following statements are true?

select all true statements

a. g(x) is a bounded function

b. g''(x) = 4g(x)

c, for each local min c, there is an interval (a, b) around c such that g(x)=g(c) for all x belong to (a, b)

d none