Mathematics, 20.06.2021 20:50 zack66828

1.Biến đổi thành tích các biểu thức sau A = 1 + 2sin a - cos 2a; B = sin a + sin 2a + sin 3a + si sin4a+sin5a+sin6a C = cos^2 (3a) + cos^2 (2a) - sin^2 a; D = cos^4 a - cos 2a + 2sin^6 a

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1.Biến đổi thành tích các biểu thức sau A = 1 + 2sin a - cos 2a; B = sin a + sin 2a + sin 3a + si si...