cos 6х+cos 8х=cos10 х+cos 12х
Cos6x+cos8x=cos10x+cos12x
2cos7xcosx=2cos11xcosx
cosx(cos7x-cos11x)=0
cosx=0 или cos7x=cos11x
x=П/2+Пn. 2sin9xsin2x=0
X=Пn/9x=Пn/2
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Answers & Comments
Cos6x+cos8x=cos10x+cos12x
2cos7xcosx=2cos11xcosx
cosx(cos7x-cos11x)=0
cosx=0 или cos7x=cos11x
x=П/2+Пn. 2sin9xsin2x=0
X=Пn/9x=Пn/2