Show that 3/2 2 cos x + cos 2x 3 for all x, and determine
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Show that –3/2 ≤ 2 cos x + cos 2x ≤ 3 for all x, and determine those values of x for which the equality holds. Plot the graph of y = 2 cos x + cos 2x for 0 ≤ x ≤ 2π.
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2 cos x cos2x 2 cos x 2 cosx1 2 cos x 2 Now 1 cos x 1 so 2 cos ...View the full answer
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