What is the exact value of cosine at 13π/12 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.
OPEN ENDED QUESTION
3 mins • 1 pt
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2.
OPEN ENDED QUESTION
3 mins • 1 pt
How can you break down the angle 13π/12 into two angles that are on the unit circle?
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3.
OPEN ENDED QUESTION
3 mins • 1 pt
Explain how to use the sum formula for cosine to find the value of cosine at 13π/12.
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4.
OPEN ENDED QUESTION
3 mins • 1 pt
What values do you need to find for the angles 3π/4 and π/3 to calculate cosine of 13π/12?
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5.
OPEN ENDED QUESTION
3 mins • 1 pt
What are the coordinates for the angle 3π/4 on the unit circle?
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