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hailinhjennie
2 năm trước
a. cot(3x + 45 degrees) = - sqrt(3) . b. sin x - sin(3x - pi/4) = 0 . c. tan(x + 10 degrees) * tan(30 degrees - 2x) = 1 . d. cos 5x * cos x = cos 4x . e. sin x + sin 2x + sin 3x + sin 4x = 0
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