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shef49
@shef49
July 2022
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Как это решить
Sinx+sin3x+cosx+cos3x=0
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Answers & Comments
Danch03
2sin2xcosx+2cos2xcosx=0
cosx(sin2x+cos2x)=0
cosx=0
x=pi/2+pik
sin2x+cos2x=0 l:cos2x
tg2x=-1
2x=pi/4 +pik
x=-pi/8+pik/2
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Answers & Comments
cosx(sin2x+cos2x)=0
cosx=0
x=pi/2+pik
sin2x+cos2x=0 l:cos2x
tg2x=-1
2x=pi/4 +pik
x=-pi/8+pik/2