TMUA 2023 Paper 1 Q9 — Worked Solution

P1·Trigonometry·5.5Official · 2023 · Q9

count-solutionscosine-equationinterval-counting

How many solutions are there to

(1 + 3 cos 3 θ)^{2} = 4

in the interval

0^{\circ} \leq θ \leq 18 0^{\circ}

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