Tập nghiệm của phương trình $3sin3x-\sqrt{3}cos9x=1+4sin^{3}3x$ là:

Question

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4 câu trả lời

Answer 1

$\left \{ \frac{\pi }{18}+k\frac{2\pi }{9},\frac{7\pi }{54}+k\frac{2\pi }{9};k\in \mathbb{Z} \right \}$

Answer 2

$\left \{ \frac{\pi }{18},\frac{7\pi }{54}\right \}$

Answer 3

$\left \{ -\frac{\pi }{54}+k\frac{2\pi }{9},\frac{\pi }{18}+k\frac{2\pi }{9};k\in \mathbb{Z} \right \}$