The graph of a sine function with a positive coefficient is shown in the figure. y 8 - TT X JT/2 JT -8 (a) Find the amplitude, period, and phase shift. (The phase shift is the first negative zero that occurs before a maximum.) amplitude period phase shift (b) Write the equation in the form y = a sin(bx + c) for a > 0, b > 0, and the least positive real number c