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kupik [55]
3 years ago
12

https://lh5.googleusercontent.com/IDO6WqjkvxWIGc9p2e16rebEccq4cDRqA5qfNh3vnrby_VHQIAfCDUJ_xR4MGwzJYlcbifs1fua-bWQ9GnlGL9f7WeIw1H

jJ_oGTS1EIXObcXBWPuLSDXS3kanTC=w515
Mathematics
1 answer:
SVEN [57.7K]3 years ago
8 0

this link doesn't work. what is the question?

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What is the exact value of cos 112.5°?
ikadub [295]
We have 112.5 = 225/2; cos112.5 < 0 because 90 < 112.5 < 180;
cos 112.5 = cos(225/2);
We use the trigonometric formula: cos(x/2) = - \sqrt{ \frac{1+cosx}{2} };
Then, cos(225/2) = - \sqrt{ \frac{1+cos225}{2} };
We have the formula: cos(270 - x) = -sinx (because cos(a-b) = cosacosb + sinasinb);
Then, cos225 = cos(270-45) = -sin45 = -\frac{ \sqrt{2} }{2} ;
Finally, cos112.5 = -\frac{ \sqrt{2- \sqrt{2} } }{2} ;

3 0
3 years ago
19. Rae supervises a loading dock. She
Rina8888 [55]

Answer:

85% of the job is finished.

Step-by-step explanation:

The way to find the percentage is to divide 119 by 140, which will come out to be .85.

Multiply .85 by 10 to have it as a whole number for the percentage.

5 0
3 years ago
Can someone help me with this
irga5000 [103]

Answer:

A

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
It costs $5820 to get new windows for a certain house. Each of the 28 windows costs the same amount.
Marina86 [1]
Alright well for (A) you will round $5280 to $5300. Then you multiply $5300 by 28.

For (B) you just round up. So again $5280 rounds up to $5300.
5 0
3 years ago
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Is 4/16 equivalent to 3/5
azamat
No, as if you reduce 4/16 it is 1/4, not 3/5, therefore they are not equivalent.
7 0
3 years ago
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