A trigonometric function of the form f (x) = sin x has been transformed to have a maximum at 6.5 and a minimum at 2.5. The equation of the new function would be: a) f(x) = 2 sin x + 4.5 b) f(x)=sin x +9 c) f (x) = 9 sin x d) f(x) = 4.5 sin 2x