Evaluate using the half angle formula 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 determines whether the cosine of the half angle is positive or negative?
The unit circle
The value of pi
The quadrant where u/2 lies
The value of u
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If u/2 equals pi/8, what is the value of u?
pi/2
pi/4
pi/6
pi/3
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the cosine of pi/4 according to the unit circle?
1
0
Square root of 2 over 2
Square root of 3 over 2
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can you simplify the expression with double fractions?
Add 1 to both the numerator and denominator
Multiply by 2 on the top and bottom
Divide by 2 on the top and bottom
Subtract 1 from both the numerator and denominator
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the final simplified form of the expression?
2 plus the square root of 2 all over 2
2 plus the square root of 2 all over 4
2 minus the square root of 2 all over 4
2 minus the square root of 2 all over 2
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