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randibekova50
@randibekova50
May 2021
1
8
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Пожалуйста помогите решить уравнение 1 и 2
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Answers & Comments
nargiz0405
Sinx+sin5x-2cos2x=0
2sin (x+5x)/2cos (x-5x)/2-2cos2x=0
2sin3xcos2x-2cos2x=0
2cos2x(sin3x-1)=0
2cos2x=0
2x=П/2+Пk
x=П/4+Пk/2
sin3x=1
3x=Пk
x=Пk/3
cos5x+cosx+2cos3x=0
2cos (5x+x)/2cos (5x-x)/2+2cos3x=0
2cos3xcos2x+2cos3x=0
2cos3x (cos2x+1)=0
2cos3x=0
3x=П/2+Пk
x=П/6+Пk/3
cos2x=-1
2x=П+2Пk
x=П/2+Пk
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Thanks 1
randibekova50
спасибо большое)
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Answers & Comments
2sin (x+5x)/2cos (x-5x)/2-2cos2x=0
2sin3xcos2x-2cos2x=0
2cos2x(sin3x-1)=0
2cos2x=0
2x=П/2+Пk
x=П/4+Пk/2
sin3x=1
3x=Пk
x=Пk/3
cos5x+cosx+2cos3x=0
2cos (5x+x)/2cos (5x-x)/2+2cos3x=0
2cos3xcos2x+2cos3x=0
2cos3x (cos2x+1)=0
2cos3x=0
3x=П/2+Пk
x=П/6+Пk/3
cos2x=-1
2x=П+2Пk
x=П/2+Пk