Question

cos(x-28 ) = 4 cos (x+28)​

Answer 1

Answer:

x = $\frac{\pi }{2} + 28 + k\pi$, k ∈ Ζ

Step-by-step explanation:

cos (x - 28) - 4cos (x - 28) = 0

-3cos (x - 28) = 0

cos (x - 28) = 0

x = $\frac{\pi }{2} + 28 + k\pi$, k ∈ Ζ