Which transformations are needed to change the parent cosine function to y = 3 cosine (10 (x minus pi))? vertical compression of 3, horizontal stretch to a period of 5 pi, phase shift of pi units to the left vertical stretch of 3, horizontal compression to a period of StartFraction pi Over 5 EndFraction, phase shift of Pi units to the right vertical compression of 3, horizontal stretch to a period of 10p, phase shift of Pi units to the right vertical stretch of 3, horizontal compression to a period of StartFraction pi Over 5 EndFraction, phase shift of Pi units to the left