Using period as an aide to evaluate for 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
What is the purpose of finding a coterminal angle when evaluating trigonometric functions?
To increase the angle's magnitude
To simplify the calculation by finding an equivalent angle within one revolution
To change the trigonometric function being evaluated
To avoid using the unit circle
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can you convert 2π into a fraction with a common denominator to add it to -, 9π / 4?
Multiply 2π by 3/3
Multiply 2π by 8/8
Multiply 2π by 4/4
Multiply 2π by 2/2
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the coterminal angle of -, 9π / 4 after adding 2π?
3π / 4
-π / 4
π / 4
-3π / 4
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In which quadrant is the angle -, π / 4 located?
Third Quadrant
First Quadrant
Fourth Quadrant
Second Quadrant
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the cosine value of the angle -, π / 4?
0
1
sqrt 2 / 2
-sqrt 2 / 2
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