Why can't the exact value of cosine for 13π/12 be directly calculated using the unit circle?
Using the additions of two angles and cosine

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Mathematics
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11th Grade - University
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Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The angle is not a standard angle on the unit circle.
The unit circle only works for angles in degrees.
Cosine values are only available for angles less than π.
The unit circle does not support angles greater than 2π.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which two angles are used to break down 13π/12 for cosine calculation?
π/2 and π/4
3π/4 and π/3
π/6 and π/3
π/4 and π/6
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the cosine sum formula used in this context?
cos(U + V) = sin(U) * cos(V) - cos(U) * sin(V)
cos(U + V) = cos(U) * cos(V) + sin(U) * sin(V)
cos(U + V) = cos(U) * cos(V) - sin(U) * sin(V)
cos(U + V) = cos(U) + cos(V)
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the cosine and sine values for the angle 3π/4?
cos: -√2/2, sin: √2/2
cos: √3/2, sin: 1/2
cos: 1/2, sin: √3/2
cos: -1/2, sin: -√3/2
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the final result for the cosine of 13π/12 after calculation?
-√3/2
-1
-1/2
-√2/4
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