
Cosine Functions and Identities

Interactive Video
•
Mathematics
•
9th - 12th Grade
•
Hard
+1
Standards-aligned

Liam Anderson
FREE Resource
Standards-aligned
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula for the cosine of the sum of two angles?
cos(A + B) = cos A * cos B + sin A * sin B
cos(A + B) = cos A * cos B - sin A * sin B
cos(A + B) = sin A * sin B - cos A * cos B
cos(A + B) = sin A * cos B + cos A * sin B
Tags
CCSS.HSF.TF.C.8
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the proof of cosine identities, what is the significance of the reference angle?
It determines the hypotenuse length.
It is used to find the cosine values.
It helps in finding the sine values.
It is irrelevant to the proof.
Tags
CCSS.HSF.TF.C.9
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you find the cosine of 15 degrees using sum or difference identities?
By adding 45 and 60 degrees
By subtracting 30 from 45 degrees
By adding 30 and 45 degrees
By subtracting 60 from 45 degrees
Tags
CCSS.HSF.TF.C.9
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the exact value of cosine 15 degrees?
(√3 - √2) / 4
(√3 + √2) / 4
(√6 - √2) / 4
(√6 + √2) / 4
Tags
CCSS.HSF.TF.A.1
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When converting radians to degrees, what is 7π/12 radians equivalent to?
135 degrees
120 degrees
105 degrees
90 degrees
Tags
CCSS.HSF.TF.C.9
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which angles in radians are used to find the cosine of 7π/12?
π/3 and π/4
π/4 and π/6
π/2 and π/4
π/3 and π/6
Tags
CCSS.HSF.TF.C.9
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the result of cosine 7π/12 using the sum identity?
(√2 + √6) / 4
(√2 - √6) / 4
(√3 + √6) / 4
(√3 - √6) / 4
Tags
CCSS.HSF.TF.A.2
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