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Gresty Academy Paper 1 · Q12

Paper 1Trigonometry

The second smallest value of ∣x∣|x| for which

cos⁡(3x+8π3)=−32\cos\left(3x+\frac{8\pi}{3}\right)=-\frac{\sqrt3}{2}

is

Aπ18\frac\pi{18}
Bπ9\frac\pi9
Cπ6\frac\pi6
D2π9\frac{2\pi}{9}
E5π18\frac{5\pi}{18}

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