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Консультация № 109035
12.11.2007, 11:28
0.00 руб.
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Здравствуйте, помогите пожалуйста выразить cosa из уравнения
cos(a+b)=cosa-2*x*I/1.73E
cos(a+b)=cosa-2*x*I/1.73E
Обсуждение
Неизвестный
12.11.2007, 12:47
общий
это ответ
Здравствуйте, Пулатова Карина Викторовна!
Здравствуйте, помогите пожалуйста выразить cosa из уравнения
cos(a+b)=cosa-2*x*I/1.73E
Не понятно, что у Вас дано. Я полагаю, что Вы на самом деле хотите найти a, а все отсальные величины известны.
Используем формулу разности косинусов:
cos(a) - cos(a + b) = 2*sin(a + b/2)sin(b/2) = 2*x*I/1.73E
sin(a + b/2) = x*I/(1.73E*sin(b/2))
a = arcsin(x*I/(1.73E*sin(b/2))) - b/2
cos(a) = cos[arcsin(x*I/(1.73E*sin(b/2))) - b/2]
Здравствуйте, помогите пожалуйста выразить cosa из уравнения
cos(a+b)=cosa-2*x*I/1.73E
Не понятно, что у Вас дано. Я полагаю, что Вы на самом деле хотите найти a, а все отсальные величины известны.
Используем формулу разности косинусов:
cos(a) - cos(a + b) = 2*sin(a + b/2)sin(b/2) = 2*x*I/1.73E
sin(a + b/2) = x*I/(1.73E*sin(b/2))
a = arcsin(x*I/(1.73E*sin(b/2))) - b/2
cos(a) = cos[arcsin(x*I/(1.73E*sin(b/2))) - b/2]
Форма ответа
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