Official papers

Official 2023 Paper 1 · Q9

Paper 1Trigonometry

How many solutions are there to

(1+3cos⁡3θ)2=4(1+3\cos3\theta)^2=4

in the interval 0∘≤θ≤180∘0^\circ\le\theta\le180^\circ?

A11
B22
C33
D44
E55
F66

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