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9-54.

No calculator! Find all point(s) of intersection for y = 3cos x and y = 2 cos2 x + 1 on the interval 0 ≤ x ≤ 2π. Homework Help ✎

Solve the equations in Step 4. Note that these solutions only give the x-values. The problem asks for the "points", so you need to calculate the corresponding y-values.