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	2	Bài viết đầu tiên mình
PT 2sin6x + cos4x - 6cos²2x + 2sin2x + 1 = 0<=> 2(sin6x + sin2x) + 2cos²2x - 1 - 6cos²2x + 1 = 0<=> 4 sin4x cos2x + 2cos²2x - 6cos²2x = 0<=> 8 sin2x cos²2x - 4 cos²2x = 0<=> cos²2x = 0 8 sin2x - 4 = 0<=> cos2x = 0 sin2x = 1/2 PT 2sin6x + cos4x - 6cos²2x + 2sin2x + 1 = 0<=> 2(sin6x + sin2x) + 2cos²2x - 1 - 6cos²2x + 1 = 0<=> 4 sin4x cos2x + 2cos²2x - 6cos²2x = 0<=> 8 sin2x cos²2x - 4 cos²2x = 0<=> cos²2x = 0 8 sin2x - 4 = 0<=> cos2x = 0 sin2x = 1/2 PT 2sin6x + cos4x - 6cos²2x + 2sin2x + 1 = 0<=> 2(sin6x + sin2x) + 2cos²2x - 1 - 6cos²2x + 1 = 0<=> 4 sin4x cos2x + 2cos²2x - 6cos²2x = 0<=> 8 sin2x cos²2x - 4 cos²2x = 0<=> cos²2x = 0 8 sin2x - 4 = 0<=> cos2x = 0 sin2x = 1/2

	1	tạo mới
PT 2sin6x + cos4x - 6cos²2x + 2sin2x + 1 = 0<=> 2(sin6x + sin2x) + 2cos²2x - 1 - 6cos²2x + 1 = 0<=> 4 sin4x cos2x + 2cos²2x - 6cos²2x = 0<=> 8 sin2x cos²2x - 4 cos²2x = 0<=> cos²2x = 0 8 sin2x - 4 = 0<=> cos2x = 0 sin2x = 1/2

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hoahoa.nhynhay: . 11/5/2018 1:39:46 PM
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hoahoa.nhynhay: . 11/5/2018 1:39:48 PM
hoahoa.nhynhay: . 11/5/2018 1:39:48 PM
hoahoa.nhynhay: . 11/5/2018 1:39:48 PM
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hoahoa.nhynhay: . 11/5/2018 1:39:49 PM
hoahoa.nhynhay: . 11/5/2018 1:39:49 PM
hoahoa.nhynhay: . 11/5/2018 1:39:49 PM
hoahoa.nhynhay: . 11/5/2018 1:39:49 PM
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