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иван676
@иван676
November 2021
2
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Преобразуйте в сумму произведения... (Кидать полное решение)
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amin07am
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Ответ ₩¥£€₩¥££€₩¥£€£₩₩£€
2 votes
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sedinalana
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1
sin3*sin5=1/2*cos(3-5)-1/2cos(3+5)=1/2*сos2-1/2*сos8
2
cos17*cos3=1/28cos(17-3)+1/2*cos(17+3)=1/2*сos14+1/2*сos20
3
cos45*cos15=1/2*cos(45-15)+1/2*cos(45+15)=1/2*cos30+1/2*cos60=
=1/2*√3/2+1/2*1/2=√3/4+1/4
4
cos20*cos10=1/2*cos(20-10)+1/2*cos(20+10)=1/2*cos10+1/2*cos30=
=1/2*cos10+√3/4
0 votes
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Answers & Comments
Verified answer
Ответ ₩¥£€₩¥££€₩¥£€£₩₩£€Verified answer
1sin3*sin5=1/2*cos(3-5)-1/2cos(3+5)=1/2*сos2-1/2*сos8
2
cos17*cos3=1/28cos(17-3)+1/2*cos(17+3)=1/2*сos14+1/2*сos20
3
cos45*cos15=1/2*cos(45-15)+1/2*cos(45+15)=1/2*cos30+1/2*cos60=
=1/2*√3/2+1/2*1/2=√3/4+1/4
4
cos20*cos10=1/2*cos(20-10)+1/2*cos(20+10)=1/2*cos10+1/2*cos30=
=1/2*cos10+√3/4