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dm217able
@dm217able
December 2021
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30/(sin^2 26º + sin^2 146º + sin^2 94º)
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rskopov
Решение:
Смотри вложение:.....
1 votes
Thanks 3
Опыт
30/(sin^2 26º + sin^2 146º + sin^2 94º) =30/((1-cos52)/2+(1+cos112)/2+(1+cos8)/2)=
=30(3/2+(cos8+cos112-cos52)/2)=30/(3/2+(cos8-2sin30sin82)/2)=
=30/(3/2+(cos8-sin82)/2)=30/(3/2)=20
2 votes
Thanks 6
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Answers & Comments
Смотри вложение:.....
=30(3/2+(cos8+cos112-cos52)/2)=30/(3/2+(cos8-2sin30sin82)/2)=
=30/(3/2+(cos8-sin82)/2)=30/(3/2)=20