CAIE A Level Mathematics 9709 · Trigonometry (A2)

Trigonometry (A2): calculation question

3 marksStandard

The equation $\sin 2x = 2\cos 40^\circ \, \sin x$ reduces to $\cos x = \cos 40^\circ$ . Solve for $0^\circ \le x < 360^\circ$ .

(a)
State the solution set in degrees.
[3]

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