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Trigonometric Equations Question

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Could anyone please help me with part b? I've been stuck on it for hours. Many thanks in advance!
Original post by RandomStudentx27
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Could anyone please help me with part b? I've been stuck on it for hours. Many thanks in advance!


Hope the 'hours' part is an over-exaggeration because it factorises into (cosxsinx)(2cosxsinx)(\cos x - \sin x)(2\cos x - \sin x)
Thank you so much!

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