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Ede4ka [16]
4 years ago
7

I have no idea how to do these

Mathematics
1 answer:
Scorpion4ik [409]4 years ago
7 0

Answer:

You have the correct answer it is the third one.

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Please help me with this question
wlad13 [49]

Answer:

-3

Step-by-step explanation:

Remember the following:

cos(x)=cos(x/2 + x/2) = cos(x/2)*cos(x/2) -sin(x/2)*sin(x/2)

cos(x)=cos2(x/2) - sin2(x/2)

We also know that sin2(a)+cos2(a)=1,

so sin2(x/2)=1 - cos2(x/2). obtained from previous step.

So, our first expression can be written as:

cos(x)=cos2(x/2)-1+cos2(x/2)

Where we obtain that: cos(x/2)= sqrt( 1+ cos(x))/ sqrt(2)

If we again use sin2(a)+cos2(a)=1, we will obtain the following relation:

sin(x/2)= sqrt(1-cos(x))/sqrt(2)

Next Tang(x/2)= sin(x/2) / cos(x/2)= sqrt(1-cos(x))/sqrt(1+cos(x))=

SQRT(9/1)=3

In the given range, cos(x), hence tan(x/2) is also negative

6 0
3 years ago
What’s the expression form of it
tamaranim1 [39]

Answer:

it

Step-by-step explanation:

i + t = it

5 0
3 years ago
Edward is scuba diving. He stops 14.3 m below the surface to look at a fish. Then he swims up 3.2 m. Which is the best approxima
FromTheMoon [43]
11 meters because if you do 14.3-5.8=8.5 then it said he went up so now you do 8.5+3.2=11.7 but instead of rounding up she rounded down (I think that’s the answer)
8 0
3 years ago
What is the value of x. 4x-10 3x+2 5x-22
Galina-37 [17]

Answer:

X=35

Step-by-step explanation:

6X =45 SO ANSWER TO THE QUESTION IS 35

7 0
3 years ago
Use the expression 3n plus 5P +2+n
Lera25 [3.4K]

Answer:


Step-by-step explanation:

3n + 5p + 2 + n


Add up all the 'n's : 4n + 5p + 2


That's all you can do with it

4 0
3 years ago
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