Предмет: Математика, автор: Аноним

Найдите все решения уравнения √3sin x = cos x, пренадлежащие отрезку {-2π;0}

Ответы

Автор ответа: okneret
0
Применены: определение тангенса,  его табличное значение
Приложения:
Автор ответа: treez0r
0
От иррациональности нужно было ещё избавиться tgx=1/√3 tgx=√3/3 потом уже таблица.)
Автор ответа: okneret
0
Да это всё равно) . Кстати, если не избавляться от иррациональности, то легче запомнить таблицу тангенса: 1/корень из 3 это 30°, потом 1 ( из числителя ) - 45°
Автор ответа: okneret
0
И корень из 3 (из знаменателя) - 60°. Вот такой приём для запоминания
Автор ответа: Аноним
0
Спасибо! :)
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4. Put the verbs into the Past Continious. We____ basketball at 6 o’clock last Sunday. *
a) were playing
b) was playing
c) did play
5. Put the verbs into the Past Continious. She____ with her friend for forty minutes yesterday. *
a) was talking
b) were talking
c) talked
6. Put the verbs into the Past Continious. You____ the window in the afternoon yesterday. *
a) washed
b) were washing
c) were washed
7.Put the verbs into the Past Simple. Anna (to have) a shower this morning *
a) was having
b) did have
c) had
8. Put the verbs into the Past Simple. They (to go) at work by bus last morning *
a) was going
b) went
c) were going
9. Put the verbs into the Past Simple. Cats (to drink) milk yesterday *
a) were drinking
b) drank
c) didn^t drank
10) Put the verbs into the Past Simple. ____you __your last holidays? *
) Enjoyed
b) Was enjoying
c) Did you enjoy
11) Write the First conditional sentences. If we … at 7 o’clock, we … on time. *
a)will leave\arrive
b) leave \will arrive
c) leaves \ arrives
12) If Bob … a good job, he … a new car. *
a) will get \ buy
b) get\ buy
c) gets \ will buy
13) If you … wine, you … sleepy. *
a) won’t drink/ don’t feel/
b) don’t drink/ won’t feel
c) doesn’t drink\ doesn’t feel
14) The child … crying if the toy …. *
a) will start/ breaks
b) start/ will break
c) starts\ break
15 ) We … to the beach if the weather …sunny tomorrow *
a) will go/ is
b) go/ be
c) goes\ will be​
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