Which equation best describes the sinusoidal function represented in this graph? Graph of x versus t showing a sinusoidal function. The function starts at the origin, goes up to a maximum value of three centimeters in 0.2 seconds, goes back to x equal to zero at 0.4 seconds, goes down to a minimum of negative three centimeters at 0.6 seconds, and then back to x equal to zero at 0.8 seconds. The curve repeats periodically