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valery00
@valery00
August 2022
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доказать тождество 2sinx*sin2x+cos3x=cosx
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EgorTat
2sinx*sin2x+cosx*cos2x-sinx*sin2x=cosx,
cosx*cos2x+sinx*sin2x=cosx,
cos(x-2x)=cosx,
cosx=cosx.
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Answers & Comments
cosx*cos2x+sinx*sin2x=cosx,
cos(x-2x)=cosx,
cosx=cosx.