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nenovaolya
@nenovaolya
June 2022
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cos^2 x+ 5cosx=6
помогите пожалуйста
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aisulukairakpa
Решениеcos2x+5cosx=0
2cos² x -1+5cosx=0
Пусть t=cosx
2t²+5t-1=0
D=33
t1=(-5-√33)/4, t2=(-5+√33)/4
x=arccos((-5-√33)/4)+pi*n
или
x=arccos((-5+√33)/4)+pi*n
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Answers & Comments
2cos² x -1+5cosx=0
Пусть t=cosx
2t²+5t-1=0
D=33
t1=(-5-√33)/4, t2=(-5+√33)/4
x=arccos((-5-√33)/4)+pi*n
или
x=arccos((-5+√33)/4)+pi*n