A
acc_cbk


• Bài 1: Cho [TEX]\frac{sin^4a}{m} + \frac{cos^4a}{n} = \frac{1}{m + n}[/TEX]
CM: [TEX]\frac{sin^10 a}{m^4} + \frac{cos^10 a}{n^4} = \frac{1}{(m + n)^4[/TEX]
• Bài 2 Cho [TEX]tan x = -3[/TEX]
CM: [TEX]\frac{7cos^5x - 4cos^4.sinx + 2cos^2.sin^3x - 5cosx.sin^4x - 6sin^5}{8sin^4.cosx - 2sin^3x.cos^2x + 3sin^2x.cos^3x - 5sinx.cos^4x + 4cos^5x}[/TEX]
CM: [TEX]\frac{sin^10 a}{m^4} + \frac{cos^10 a}{n^4} = \frac{1}{(m + n)^4[/TEX]
• Bài 2 Cho [TEX]tan x = -3[/TEX]
CM: [TEX]\frac{7cos^5x - 4cos^4.sinx + 2cos^2.sin^3x - 5cosx.sin^4x - 6sin^5}{8sin^4.cosx - 2sin^3x.cos^2x + 3sin^2x.cos^3x - 5sinx.cos^4x + 4cos^5x}[/TEX]
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