Simplify the expression.cos2 4x - sin2 4x
A. 
sin 16x
B. 2 sin 4x
C. cos 8x
D. cos 4x
Answer: C
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Use the information given about the angle ?, 0 ? ? ? 2?, to find the exact value of the indicated trigonometric function.cos ? = - 
, csc ? < 0Find cos (2?).
A. 
B. 
C. - 
D. 
Race was originally conceptualized as what kind of a concept?
A. cognitive B. cultural C. biological D. social
Solve the problem.To train for a race, Will begins by jogging 11 minutes one day per week. He increases his jogging time by 6 minutes each week. Write the general term of this arithmetic sequence, and find how many whole weeks it takes for him to reach a jogging time of one hour.
A. ak = 6k + 5; 10 weeks B. ak = 6k + 11; 10 weeks C. ak = 6k + 11; 9 weeks D. ak = 6k + 5; 9 weeks
Write the trigonometric expression as an algebraic expression containing u and v.cos (sin-1 u - cos-1 v)
A. uv - (
)(
)
B. v
+ u
C. v
- u
D. uv + (
)(
)