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Question 9 (6 marks) Require full justification. Find all values of x in the interval [0, 2x] that satisfy cos(2x) -cos(x) =0 [Hint: cos(2x) =

Question 9 (6 marks) Require full justification. Find all values of x in the interval [0, 2x] that satisfy cos(2x) -cos(x) =0 [Hint: cos(2x) = 2cos2 (x) - 1]

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