[Toán 11] Phương trình lượng giác

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ngocbangngoc

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nguyenbahiep1

câu 1

[laTEX] sin^24x - cos^2 6x = sin ( 10,5.\pi+10x) \\ \\ 1 - cos8 x - 1 - cos12x = 2.cos10x \\ \\ - cos10x.cos2x = cos10 x \\ \\ cos10 x = 0 \\ \\ cos2x = - 1[/laTEX]
 
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