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Clavis TMUA Set C Paper 1 · Q9

Paper 1TrigonometryFunctions & graphs

Find the sum of all the solutions of

2cos⁡2x=1+cos⁡x2\cos^2x=1+\cos x

in the range 0∘<x<360∘0^\circ<x<360^\circ.

A360∘360^\circ
B480∘480^\circ
C600∘600^\circ
D720∘720^\circ
E840∘840^\circ
F960∘960^\circ

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