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alekseicat
@alekseicat
August 2021
1
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Номер 3 !!срочно пожалуйста!!!
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sedinalana
(cosa-cosb)²+(sina-sinb)²=cos²a+cos²b-2cosacosb+sin²a+sin²b-2sinasinb=
=2-2(cosacosb+sinasinb)=2-2cos(a-b)=2(1-cos(a-b))
4sin²[(a-b)/2]=4*(1-cos(a-b)/2=2(1-cos(a-b))
2(1-cos(a-b))=
2(1-cos(a-b))
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Answers & Comments
=2-2(cosacosb+sinasinb)=2-2cos(a-b)=2(1-cos(a-b))
4sin²[(a-b)/2]=4*(1-cos(a-b)/2=2(1-cos(a-b))
2(1-cos(a-b))=2(1-cos(a-b))