AM-2628

Trigonometric equations

A Math · Secondary 4 · Hard · Trigonometric equations

1. $x = \dfrac{\pi}{9},\dfrac{4\pi}{9},\dfrac{7\pi}{9},\dfrac{10\pi}{9},\dfrac{13\pi}{9},\dfrac{16\pi}{9}$
2. $x = \dfrac{\pi}{3},\dfrac{4\pi}{3}$
3. $x = \dfrac{\pi}{9},\dfrac{7\pi}{9},\dfrac{13\pi}{9}$
4. $x = \dfrac{2\pi}{9},\dfrac{5\pi}{9},\dfrac{8\pi}{9},\dfrac{11\pi}{9},\dfrac{14\pi}{9},\dfrac{17\pi}{9}$

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