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Ilia_Sergeevich [38]
2 years ago
7

Explain how the sum and difference formula cos(A+/- B) = cosA cosB -/+ sinA sinB could be useful?

Mathematics
2 answers:
Nadya [2.5K]2 years ago
7 0
You could find the exact value of cos of 15 degrees   by  using cos(45 - 30):-

cos(45 - 30) = cos 45cos30 + sin45 sin30  = 1 /sqrt2 * sqrt3/2 +  1/sqrt2* 1/2 
serg [7]2 years ago
6 0
One way it's useful is in the application of phasors in physics. Phasors require you to add up vectors of two different angles, so the cosine angle addition formula can be used if you already know the cosine and sine of the original vector angles.
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mafiozo [28]

Step one: 200-87.96=112.04

Step two: 112.04÷30≈3.7

Step three: 3.7↔3

Answer: Staci can buy 3 shirts

5 0
2 years ago
Find the measure of the indicated angle.<br>​
tester [92]

Answer:

11) x = 21

12) x = 110

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4 0
2 years ago
A total of 697 tickets were sold for the school play. They were either adult tickets or student tickets. There were 53 fewer stu
Burka [1]
Let x = number of adult tickets sold
Let x-53 = number of student tickets sold

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Add 53 to both sides to get:

2x = 750

Divide both sides by 2 to get:

x = 375

375 adult tickets were sold. 
5 0
3 years ago
What the answer please help me i need it now I’ll mark brainleist.
Vesna [10]

Answer:

Step-by-step explanation:

slope is -7

5 0
2 years ago
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2. In a relationship between variables, what is the variable called that changes in response to
valkas [14]

Answer:

A dependent variable

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is a variable whose value will change depending on the value of another variable, called the independent variable. Dependent variables are also known as outcome variables, left-hand-side variables, or response variables.

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