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RaspberryYogurt
RaspberryYogurt
02.05.2021 21:16 •  Алгебра

1- cos a + sin a (представьте в виде произведения или частного выражение) объясните как решать

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Ответ:
daniiltpgatov6
daniiltpgatov6
02.05.2021
1-cosa+sina=1+(sina-sin(90^\circ -a))=\\\\=1+2\cdot cos45^\circ \cdot sin(a-45^\circ )=1+2\cdot \frac{\sqrt2}{2}\cdot sin(a-45^\circ )=\\\\=1+\sqrt2\cdot sin(a-45^\circ )=\sqrt2\cdot (\underbrace {\frac{1}{\sqrt2}}_{\frac{\sqrt2}{2}=sin45}+sin(a-45^\circ ))=\\\\=\sqrt2\cdot (sin45^\circ +sin(a-45^\circ))=\sqrt2\cdot 2\cdot sin\frac{a}{2}\cdot cos(45^\circ -\frac{a}{2})=\\\\=2\sqrt2\cdot sin\frac{a}{2}\cdot sin(\frac{a}{2}+45^\circ)\; ;\\\\\\Formylu:\\\\cosx=sin(90^\circ -x)\\\\sinx-siny=2\cdot sin\frac{x-y}{2}\cdot cos\frac{x+y}{2}\\\\sinx+siny=2\cdot sin\frac{x+y}{2}\cdot cos\frac{x-y}{2}
4,8(31 оценок)
Ответ:
mon13
mon13
02.05.2021
ответ ответ ответ ответ ответ ответ
1- cos a + sin a (представьте в виде произведения или частного выражение) объясните как решать
4,8(13 оценок)
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Ответ:
alinaara
alinaara
02.05.2021
Пусть первое число х, тогда второе число на у больше первого,а третье число больше второго так же на у.
1число-х
2число-х+y
3число-х+2у
По условию задачи произведение первого числа на третье,меньше квадрата второго на 49. Составим уравнение:
(x+y)^2-x(x+2y)=49
x^2+2xy+y^2-x^2-2xy=49
y^2=49
y1=7
y2= -7
По условию задачи даны натуральные числа,поэтому у2 не удовлетворяет условию задачи. Значит второе число больше первого на 7, а третье число,которое является наибольшим числом на 14 больше первого числа,которое является наименьшим. Т.е. наименьшее число меньше наибольшего на 14.
4,7(96 оценок)
Ответ:
Bячеслав
Bячеслав
02.05.2021

Объяснение:

WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.

4,5(64 оценок)
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