April 2021 0 3 Report
Помогите, пожалуйста, срочно. алгебра, 10 класс, тригонометрия, формулы сложения: Используя формулы сложения, докажите следующие формулы сведения:
1) cos (pi - a) = -cos a
2) tg (pi + a) = tg a
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