Which of the following functions has an amplitude of 3 and a phase shift of pi over 2 question mark f (x) = 3cos(2x ) 4 g(x) = 3cos(2x ) 1 h of x is equal to 3 times cosine of the quantity 2 times x minus pi over 2 end quantity plus 3 j of x is equal to negative 2 times cosine of the quantity 2 times x plus pi over 2 end quantity plus 3