Предмет: Алгебра, автор: KLAN110

Добрый день, помогите пожалуйста, пасибо

Знайдіть sin a і tg a , якщо sin a=0,6

sangers1959: В какой четверти находится угол а?
KLAN110: там вместо cos надо узнать sin, а насчет четверти угла нечего не сказано
sangers1959: То есть, cosa=0,6. sina=? tga=?
KLAN110: то есть, sin a, tg a, если sin= a 0,6
sangers1959: Зачем тогда находить sina, если он дан в условии?
KLAN110: ибо в задачи было все не правильно... нам надо найти sin a, tg a, если cos a = -0,6

Ответы

Автор ответа: bahytgulkabylainova
0

Объяснение:

см фото,,,,,,,,,,,,,,,,,,,

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2. Did people construct wooden beam type bridges in Middle Ages?
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Текст:

EXPERIMENTAL BRIDGE
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In Middle Ages, people constructed wooden beam type bridges. They were usually built on stone piers or wooden piles. Bridges of this type are still used in Japan and India.
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