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kati70
@kati70
July 2022
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пожалуйста помогите решать срочнооо
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sedinalana
Понизим степень
1/2*(1+cos(3π/4-a/2))-1/2(1+cos(11π/4+a/2))=
1/2-1/2+1/2(cos(3π/4-a/2)-cos(11π/4+a/2))=
1/2*(-2)sin(-π-a/2)sin7π/4=-sina/2*(-√2/2)=√2/2sina/2
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Answers & Comments
1/2*(1+cos(3π/4-a/2))-1/2(1+cos(11π/4+a/2))=
1/2-1/2+1/2(cos(3π/4-a/2)-cos(11π/4+a/2))=
1/2*(-2)sin(-π-a/2)sin7π/4=-sina/2*(-√2/2)=√2/2sina/2