CPM Homework Help : CALC Problem 9-54

No calculator! Find all point(s) of intersection for $y = 3\operatorname{cos} x$ and $y = 2 \operatorname{cos}^2 x + 1$ on the interval $0 ≤ x ≤ 2π$ . Compute without a calculator

Step:

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.