TMUA 2022 Paper 1 Q1 — Worked Solution

P1·Trigonometry·4.5Official · 2022 · Q1

hidden-quadraticrange-of-cosinecount-solutions

How many real solutions are there to the equation

2 cos^{4} θ - 5 cos^{2} θ + 3 = 0

in the interval

0 \leq θ \leq 2 π

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