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Beyond Horizon Set 4 Paper 1 · Q13

Paper 1TrigonometryAlgebra

Find the number of solutions of the equation

xsin⁡3x=cos⁡xx\sin3x=\cos x

in the interval 0≤x≤3π0\leq x\leq3\pi.

A11
B33
C55
D77
E99

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