Question

Plz help me with this

Answer 1

Answer:
`\bold{d)\quad y = 3 cos ((4)/(3)x-2\pi) + 2}`

Explanation:

`\text{Period = }(2\pi)/(B)\\\\\\(1)/(2)\text{Period = }(1)/(2)\cdot (2\pi)/(B)\quad =(2\pi)/(2B)\\\\\\\text{In the given equation, B = }(2)/(3)\implies 2B=(2\cdot 2)/(3)\quad =(4)/(3)\\`

The only option that has B = 4/3 is the last one.