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marisshechka1
@marisshechka1
August 2022
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Помогите пожалуйста решить тригонометрию
Вычислите cos(a+b) и cos(a-b), если sina=3/5, cosb=4/5 и
0<a<п/2, 0<b<п/2
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Лавган
Cos(a+b)=7/25. cos(a-b)=1. применяем формулы
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