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Marisabel10061999
@Marisabel10061999
October 2021
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3,4)решите уравнения (во вложении)
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wangross
4)
а)
2cos(-x/2+π/4) = -2 ;
cos(-(x/2-π/4)) = -1;
cos(x/2-π/4) = -1; * * * cos функция четная cos(-α)=cosα * * *
x/2-π/4 =π+2π*k ;
x =5π/2+4π*k , k∈Z.
б)
-sin(-3x) =√2/2 ;
sin3x =√2/2 ; * * * sin функция нечетная sin(-α) = - sinα * * *
3x =(-1)^(k)*π/4 +π*k ;
x = (-1)^(k)*π/12 +π/3*k ; k∈Z.
2 votes
Thanks 1
Marisabel10061999
спасибо большое)))
oganesbagoyan
Verified answer
3)
а.
б.
в.
г.
4) a.
б.
0 votes
Thanks 1
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Answers & Comments
а) 2cos(-x/2+π/4) = -2 ;
cos(-(x/2-π/4)) = -1;
cos(x/2-π/4) = -1; * * * cos функция четная cos(-α)=cosα * * *
x/2-π/4 =π+2π*k ;
x =5π/2+4π*k , k∈Z.
б) -sin(-3x) =√2/2 ;
sin3x =√2/2 ; * * * sin функция нечетная sin(-α) = - sinα * * *
3x =(-1)^(k)*π/4 +π*k ;
x = (-1)^(k)*π/12 +π/3*k ; k∈Z.
Verified answer
3)а.
б.
в.
г.
4) a.
б.