Предмет: Математика, автор: gjskjs

Определить знак выражения: А) cos 3π/5 tgπ/9

Ответы

Автор ответа: ЕнотЕнотыч

1

tgπ/9 - первая четверть, знак "+"
cos3π/5 - вторая четверть, знак "-"
минус×плюс=минус
Ответ: минус.

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