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Вопрос по алгебре:
2cos(x+п/4)cos(2x+п/4)+sin3x -упростить
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Автор:
nina9
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Ответ:
2cos(x+п/4)cos(2x+п/4)+sin3x=2*1/2(cos(х+п/4-2х-п/4)+cos(х+п/4+2х+п/4)+sin3х=cosх+cos(3х+п/2)+sin3х=cosх-sin3х+sin3х=cosх
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Вопрос по английскому языку:
1. He knows Africa well because he (travel) a lot there.
A has been travelling
B has travelled
2. You (write) this composition for two hours and can't complete it.
A have been writing
B have written
3. – John is still repairing his car.
– He must be tired. He (repair) it all day.
A has repaired
B has been repairing
4. Alice promised to come, but she's absent. Something (happen) to her.
A has been happening
B has happened
5. The children are drawing. They (draw) since they came home.
A have been drawing
B have drawn
6. ... they (tell) anything about their summer plans?
A Have they been telling
B Have they told
7. My aunt (have) the big house in the country.
A has always been having
B has always had-
Ответов: 1
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