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Определите знак выражения sin290° • cos 70° • tg 100°.
1) +
2) -
3) определить знак невозможно
Ответы 1
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290°∈ IV четверти ( синус с минусом)70°∈ I четверти (косинус с плюсом)100°∈II четверти ( тангенс с минусом)Ответ: +
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Автор:
captain100 - 6 лет назад
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В озере плавает плоская льдина толщиной 10 см и объёмом 0, 1 м^3. Плотность льда 900 кг/м^3.
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Определите знак выражения sin290° • cos 70° • tg 100°.
1) +
2) -
3) определить знак невозможно -
Найдите sinа. если cosa =-7/25 и π<а<1,5π.
Выберите один ответ:
0,96
-0,72
0,72
±0,96
-0,96 -
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Russia Is My Country
1. What do you know about the country you live in? Russia is the largest country in the world. It extends to the Pacific Ocean in the east, the Arctic Ocean in the north and the Caucasus Mountains and the Black Sea in the south. We know that the territory behind the Ural Mountains is Siberia and the territory near the Pacific Ocean is the Far East. It takes more than ten hours to get from the east to the west of the country by plane.
2. The country is very large indeed. The climate is different in different places: the north is famous for its ice, snow and low temperatures but in the south the weather is warm in winter and hot in summer.
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michaelibcm - 6 лет назад
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