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20-04-2020
Mathematics

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

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20-04-2020

Answer:

x = [tex]\frac{\pi }{2} + 28 + k\pi[/tex], k ∈ Ζ

Step-by-step explanation:

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

-3cos (x - 28) = 0

cos (x - 28) = 0

x = [tex]\frac{\pi }{2} + 28 + k\pi[/tex], k ∈ Ζ

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