Предмет: Алгебра, автор: ElizabethLahey

Помогите пожалуйста.
1) sin40-sin20=
2)cos48-cos12=
3) tg47-tg37=

dbookerkst: преобразовать в произведение?

Ответы

Автор ответа: dbookerkst
1
Решение во вложении.
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