срочно решите пожалуйста_) Хотябы 3 задание?!

срочно решите пожалуйста_) Хотябы 3 задание?!
- Предмет:
  Математика
- Автор:
  alex566
- 5 лет назад

Ответы 1

1.a) cos(70-10)=cos60=0.5 б)sin (35-5)=sin30=0.5 в) cos135= cos(90+45)=cos90*cos45-sin90*sin45=0*√2/2-1*√2/2=- √2/22. a) 4(cos²210-sin² 210)=4* cos(2*210)=4 cos420=4*cos (360+60)= 4*cos60=4*0.5=2 б) 2sin75*cos75=sin(2*75)=sin150=sin (180-30)=sin30=0.5
- Автор:
  rambler
- 5 лет назад
- 0
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When the twins Tim and Tom were born, their mother and father and grandparents were really very happy, but they were also a little puzzled. You see, Tim and Tom were born into a dark-haired Irish family. Their parents both had coal black hair. Their grandparents also used to have heads of thick black hair. Now, their grandparents’ hair was turning silver. In fact, all the uncles, aunts and cousins in the family had very dark thick black hair. In Ireland, people with black hair and dark eyes are called “black Irish,” and this is ofen a sign of beauty.Teir relatives, who visited them in the hospital, immediately thought that Tim and Tom were just cute as a button. But, everyone was at a loss as to why they had full heads of bright red hair. Tough there is no lack of redheads, or “gingers,” in Ireland, no one could think of a family member with red hair. It was clear that the twins had their father’s distinctive chin and nose. Also, from their first viewing, all the relatives commented on how the boys had their mother’s eyes and dimples. But, they also joked that the twins had been kissed by a leprechaun, and that was the reason for their bright red hair. Afer seeing the boys, their great uncle Bill went home to look through old photos. Tere, he discovered a picture of a distant relative: the sister of the twins’ great grandmother, Aunt Lizzie. Her picture was in black and white, but it was clear that her hair was lighter than her sister’s. No one can tell for sure if great, great Aunt Lizzie was a ginger, but the family was happy to say that the mystery was solved.
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срочно решите пожалуйста_) Хотябы 3 задание?!

Ответы 1

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