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Cos 6x + cos 8x = cos 10x+ cos 12x
cos6x+cos8x=cos10x+cos12x
2cos7xcosx=2cos11xcosx
cosx(cos7x-cos11x)=0
cosx=0 cos7x=cos11x
x=П/2+Пn 2sin9xsin2x=0
x=Пn/9 x=Пn/2
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cos6x+cos8x=cos10x+cos12x
2cos7xcosx=2cos11xcosx
cosx(cos7x-cos11x)=0
cosx=0 cos7x=cos11x
x=П/2+Пn 2sin9xsin2x=0
x=Пn/9 x=Пn/2