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kukuku007
@kukuku007
July 2022
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Помогите решить пожалуйста!!!!!11Очень надо!!!!!!!!!!!!!!!!!!!!!!
cosx *cos2x=1
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mikael2
Verified answer
cosx(2 cos²x-1)=1 2cos³x-cosx-1=0 z=cosx
2z³-z-1=0 подберем корень
z=1
2-1-1=0
делим уголком 2z³-z-1 /z-1 получаем частное 2z²+2z+1=0
D=4-8<0 корней нет
z=1 cosx=1 x=2πn n∈Z
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Answers & Comments
Verified answer
cosx(2 cos²x-1)=1 2cos³x-cosx-1=0 z=cosx2z³-z-1=0 подберем корень z=1 2-1-1=0
делим уголком 2z³-z-1 /z-1 получаем частное 2z²+2z+1=0
D=4-8<0 корней нет
z=1 cosx=1 x=2πn n∈Z